media: rtl28xxu: make array rc_nec_tab static const

Don't populate the array rc_nec_tab on the stack, instead make it
static const. Makes the object code smaller by over 620 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
  49511	  17040	     64	  66615	  10437	rtl28xxu.o

After:
   text	   data	    bss	    dec	    hex	filename
  48825	  17104	     64	  65993	  101c9	rtl28xxu.o
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/dvb-usb-v2/rtl28xxu.c

@@ -1598,7 +1598,7 @@ static int rtl2831u_rc_query(struct dvb_usb_device *d)
 	struct rtl28xxu_dev *dev = d->priv;
 	u8 buf[5];
 	u32 rc_code;
-	struct rtl28xxu_reg_val rc_nec_tab[] = {
+	static const struct rtl28xxu_reg_val rc_nec_tab[] = {
 		{ 0x3033, 0x80 },
 		{ 0x3020, 0x43 },
 		{ 0x3021, 0x16 },