[Silabs] [WiFi] Adding the lock and unlock chip stack and some build fixes for 917 SoC

[chirag-silabs]

PR #26180 added assert on the task ownership of the chip Stack lock on some SystemLayer timer calls.
On power cycle when the device try to connect to the older network the device is failing with this error. Adding lock and unlock chip stack for the init of networkcommissioningwifidriver.cpp

[00:00:00.977][error ][DL] Chip stack locking error at 'src/system/SystemLayerImplFreeRTOS.cpp:94'. Code is unsafe/racy
[00:00:00.977][error ][-] chipDie chipDie chipDie

Small fix for 917 SoC, build failure

[github-actions]

PR #26245: Size comparison from bcf1b80 to 4ea8b71

Increases (1 build for cc32xx)

platform	target	config	section	bcf1b80	4ea8b71	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	19489249	19489250	1	0.0

Full report (1 build for cc32xx)

platform	target	config	section	bcf1b80	4ea8b71	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	601114	601114	0	0.0
			(read/write)	204132	204132	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197544	197544	0	0.0
			.comment	206	206	0	0.0
			.data	1468	1468	0	0.0
			.debug_abbrev	956756	956756	0	0.0
			.debug_aranges	103416	103416	0	0.0
			.debug_frame	349704	349704	0	0.0
			.debug_info	19489249	19489250	1	0.0
			.debug_line	2678035	2678035	0	0.0
			.debug_line_str	513	513	0	0.0
			.debug_loc	33340	33340	0	0.0
			.debug_loclists	1501882	1501882	0	0.0
			.debug_ranges	4984	4984	0	0.0
			.debug_rnglists	96008	96008	0	0.0
			.debug_str	3024877	3024877	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104170	104170	0	0.0
			.shstrtab	265	265	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	477531	477531	0	0.0
			.symtab	285936	285936	0	0.0
			.text	494824	494824	0	0.0