[media] rc: rename the remaining things to rc_core

The Remote Controller subsystem is meant to be used not only by Infra Red
but also for similar types of Remote Controllers. The core is not specific
to Infra Red. As such, rename:
	- ir-core.h to rc-core.h
	- IR_CORE to RC_CORE
	- namespace inside rc-core.c/rc-core.h

To be consistent with the other changes.

No functional change on this patch.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index 539bec2..db7787a 100644
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -37,7 +37,7 @@
 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/usb/input.h>
-#include <media/ir-core.h>
+#include <media/rc-core.h>
 
 #define DRIVER_VERSION	"1.91"
 #define DRIVER_AUTHOR	"Jarod Wilson <jarod@wilsonet.com>"