dt: fix broken links due to txt->yaml renames

There are some new broken doc links due to yaml renames
at DT. Developers should really run:

	./scripts/documentation-file-ref-check

in order to solve those issues while submitting patches.
This tool can even fix most of the issues with:

	./scripts/documentation-file-ref-check --fix

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/0e4a7f0b7efcc8109c8a41a2e13c8adde4d9c6b9.1592203542.git.mchehab+huawei@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/bridge/sii902x.txt

@@ -37,7 +37,7 @@ Optional properties:
 	simple-card or audio-graph-card binding. See their binding
 	documents on how to describe the way the sii902x device is
 	connected to the rest of the audio system:
-	Documentation/devicetree/bindings/sound/simple-card.txt
+	Documentation/devicetree/bindings/sound/simple-card.yaml
 	Documentation/devicetree/bindings/sound/audio-graph-card.txt
 	Note: In case of the audio-graph-card binding the used port
 	index should be 3.

Documentation/devicetree/bindings/display/rockchip/rockchip-drm.yaml

@@ -24,7 +24,7 @@ properties:
     description: |
       Should contain a list of phandles pointing to display interface port
       of vop devices. vop definitions as defined in
-      Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
+      Documentation/devicetree/bindings/display/rockchip/rockchip-vop.yaml
 
 required:
   - compatible

Documentation/devicetree/bindings/net/mediatek-bluetooth.txt

@@ -3,7 +3,7 @@ MediaTek SoC built-in Bluetooth Devices
 
 This device is a serial attached device to BTIF device and thus it must be a
 child node of the serial node with BTIF. The dt-bindings details for BTIF
-device can be known via Documentation/devicetree/bindings/serial/8250.txt.
+device can be known via Documentation/devicetree/bindings/serial/8250.yaml.
 
 Required properties:
 

Documentation/devicetree/bindings/sound/audio-graph-card.txt

@@ -5,7 +5,7 @@ It is based on common bindings for device graphs.
 see ${LINUX}/Documentation/devicetree/bindings/graph.txt
 
 Basically, Audio Graph Card property is same as Simple Card.
-see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
+see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.yaml
 
 Below are same as Simple-Card.
 

Documentation/devicetree/bindings/sound/st,sti-asoc-card.txt

@@ -5,7 +5,7 @@ codec or external codecs.
 
 sti sound drivers allows to expose sti SoC audio interface through the
 generic ASoC simple card. For details about sound card declaration please refer to
-Documentation/devicetree/bindings/sound/simple-card.txt.
+Documentation/devicetree/bindings/sound/simple-card.yaml.
 
 1) sti-uniperiph-dai: audio dai device.
 ---------------------------------------

Documentation/mips/ingenic-tcu.rst

@@ -68,4 +68,4 @@ and frameworks can be controlled from the same registers, all of these
 drivers access their registers through the same regmap.
 
 For more information regarding the devicetree bindings of the TCU drivers,
-have a look at Documentation/devicetree/bindings/timer/ingenic,tcu.txt.
+have a look at Documentation/devicetree/bindings/timer/ingenic,tcu.yaml.

MAINTAINERS

@@ -3946,7 +3946,7 @@ L:	linux-crypto@vger.kernel.org
 S:	Supported
 F:	drivers/char/hw_random/cctrng.c
 F:	drivers/char/hw_random/cctrng.h
-F:	Documentation/devicetree/bindings/rng/arm-cctrng.txt
+F:	Documentation/devicetree/bindings/rng/arm-cctrng.yaml
 W:	https://developer.arm.com/products/system-ip/trustzone-cryptocell/cryptocell-700-family
 
 CEC FRAMEWORK
@@ -5490,7 +5490,7 @@ F:	include/uapi/drm/r128_drm.h
 DRM DRIVER FOR RAYDIUM RM67191 PANELS
 M:	Robert Chiras <robert.chiras@nxp.com>
 S:	Maintained
-F:	Documentation/devicetree/bindings/display/panel/raydium,rm67191.txt
+F:	Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml
 F:	drivers/gpu/drm/panel/panel-raydium-rm67191.c
 
 DRM DRIVER FOR ROCKTECH JH057N00900 PANELS