[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/ttpci/budget-ci.c b/drivers/media/dvb/ttpci/budget-ci.c
index 32caa9b..8ae67c1 100644
--- a/drivers/media/dvb/ttpci/budget-ci.c
+++ b/drivers/media/dvb/ttpci/budget-ci.c
@@ -159,7 +159,7 @@
 	    budget_ci->ir.rc5_device != (command & 0x1f))
 		return;
 
-	ir_keydown(dev, budget_ci->ir.ir_key, (command & 0x20) ? 1 : 0);
+	rc_keydown(dev, budget_ci->ir.ir_key, (command & 0x20) ? 1 : 0);
 }
 
 static int msp430_ir_init(struct budget_ci *budget_ci)