Mark the modules as VNDK in Android.bp

As a VNDK module, Android.bp must have 'vndk' tag as well as
'vendor_available: true'.

The 'vndk' tag for VNDK module is formated as below:
vndk: {
        enabled: true,
},

VNDK modules will be installed both in system/lib(64) as normal and
in system/lib(64)/vndk as a vendor variant.

Bug: 63866913
Test: build and boot with BOARD_VNDK_VERSION=current
Merged-In: Icecb22ed2ed0f58c3168605d4cf64815e2dda750
Change-Id: Icecb22ed2ed0f58c3168605d4cf64815e2dda750
(cherry picked from commit 9b0ed72)

libcrypto_utils/Android.bp

@@ -17,6 +17,9 @@
 cc_library {
     name: "libcrypto_utils",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     host_supported: true,
     srcs: [
         "android_pubkey.c",

libdiskconfig/Android.bp

@@ -1,6 +1,9 @@
 cc_library {
     name: "libdiskconfig",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     srcs: [
         "diskconfig.c",
         "diskutils.c",

libnetutils/Android.bp

@@ -1,6 +1,9 @@
 cc_library_shared {
     name: "libnetutils",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
 
     srcs: [
         "dhcpclient.c",

libprocinfo/Android.bp

@@ -23,6 +23,9 @@ libprocinfo_cppflags = [
 cc_library {
     name: "libprocinfo",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     host_supported: true,
     srcs: [
         "process.cpp",

libsuspend/Android.bp

@@ -3,6 +3,9 @@
 cc_library {
     name: "libsuspend",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
 
     srcs: [
         "autosuspend.c",

libsysutils/Android.bp

@@ -1,6 +1,9 @@
 cc_library_shared {
     name: "libsysutils",
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
 
     srcs: [
         "src/SocketListener.cpp",

libusbhost/Android.bp

@@ -16,6 +16,10 @@
 
 cc_library {
     name: "libusbhost",
+    vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     host_supported: true,
     srcs: ["usbhost.c"],
     cflags: ["-Werror"],