[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/dvb/dvb-usb/lmedm04.c b/drivers/media/dvb/dvb-usb/lmedm04.c
index f0c0308..1455c23 100644
--- a/drivers/media/dvb/dvb-usb/lmedm04.c
+++ b/drivers/media/dvb/dvb-usb/lmedm04.c
@@ -198,7 +198,7 @@
 	deb_info(1, "INT Key Keypress =%04x", keypress);
 
 	if (keypress > 0)
-		ir_keydown(d->rc_dev, keypress, 0);
+		rc_keydown(d->rc_dev, keypress, 0);
 
 	return 0;
 }