media: usb: make snd_pcm_hardware const

Make these const as they are only used during a copy operation.
Done using Coccinelle.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/usbtv/usbtv-audio.c

@@ -43,7 +43,7 @@
 
 #include "usbtv.h"
 
-static struct snd_pcm_hardware snd_usbtv_digital_hw = {
+static const struct snd_pcm_hardware snd_usbtv_digital_hw = {
 	.info = SNDRV_PCM_INFO_BATCH |
 		SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_INTERLEAVED |