treewide: capitalize 'USB'

Change-Id: I7650786ea50465a4c2d11de948fdb81f4e509772
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39100
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/apollolake/chip.c

@@ -842,7 +842,7 @@ void platform_fsp_notify_status(enum fsp_notify_phase phase)
 
 		/*
 		 * Override GLK xhci clock gating register(XHCLKGTEN) to
-		 * mitigate usb device suspend and resume failure.
+		 * mitigate USB device suspend and resume failure.
 		 */
 		if (CONFIG(SOC_INTEL_GLK)) {
 			uint32_t *cfg;