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 <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

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

···
 	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 },