[media] rc-core: merge rc-map.c into rc-main.c

With this change, all rc-core functions are into just one file, except
for the rc-raw specific functions.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/media/rc/Makefile
Simple merge

diff --cc drivers/media/rc/rc-main.c
Simple merge

diff --cc drivers/media/rc/rc-map.c
Simple merge