[media] Rename all public generic RC functions from ir_ to rc_

Those functions are not InfraRed specific. So, rename them to properly
reflect it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c
index b7d3999..e32eb38 100644
--- a/drivers/media/video/em28xx/em28xx-input.c
+++ b/drivers/media/video/em28xx/em28xx-input.c
@@ -297,12 +297,12 @@
 			poll_result.toggle_bit, poll_result.read_count,
 			poll_result.rc_address, poll_result.rc_data[0]);
 		if (ir->full_code)
-			ir_keydown(ir->rc,
+			rc_keydown(ir->rc,
 				   poll_result.rc_address << 8 |
 				   poll_result.rc_data[0],
 				   poll_result.toggle_bit);
 		else
-			ir_keydown(ir->rc,
+			rc_keydown(ir->rc,
 				   poll_result.rc_data[0],
 				   poll_result.toggle_bit);