[media] ir-raw: fix sparse non-ANSI function warning

Fix sparse warning for non-ANSI function declaration:

drivers/media/rc/ir-raw.c:247:30: warning: non-ANSI function declaration of function 'ir_raw_get_allowed_protocols'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>