ALSA: usb-audio: make read-only array marker static const

Don't populate the read-only array marker on the stack but instead make
it static const. Also makes the object code a little smaller.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220809181544.3046429-1-colin.i.king@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/pcm.c

@@ -1269,7 +1269,7 @@ static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
 	unsigned int wrap = subs->buffer_bytes;
 	u8 *dst = urb->transfer_buffer;
 	u8 *src = runtime->dma_area;
-	u8 marker[] = { 0x05, 0xfa };
+	static const u8 marker[] = { 0x05, 0xfa };
 	unsigned int queued = 0;
 
 	/*