usb: gadget: u_audio: Use C99 syntax for array initializers

usb: gadget: u_audio: Use C99 syntax for array initializers

Convert array initializers to C99 syntax by adding the '=' after
each designated initializer.

Fix the following smatch warnings:

drivers/usb/gadget/function/u_audio.c:1117:20:
warning: obsolete array initializer, use C99 syntax
drivers/usb/gadget/function/u_audio.c:1124:28:
warning: obsolete array initializer, use C99 syntax
drivers/usb/gadget/function/u_audio.c:1131:19:
warning: obsolete array initializer, use C99 syntax
drivers/usb/gadget/function/u_audio.c:1138:27:
warning: obsolete array initializer, use C99 syntax
drivers/usb/gadget/function/u_audio.c:1145:25:
warning: obsolete array initializer, use C99 syntax

Also, fix two checkpatch.pl warnings:

WARNING: please, no spaces at the start of a line
+  [UAC_FBACK_CTRL] = {$

WARNING: please, no spaces at the start of a line
+  [UAC_MUTE_CTRL] = {$

Signed-off-by: Abhishek Tamboli <abhishektamboli9@gmail.com>
Reviewed-by: Ricardo B. Marliere <ricardo@marliere.net>
Link: https://lore.kernel.org/r/20240801190209.500373-1-abhishektamboli9@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>