[media] DRX-K: Shrink size of drxk_map.h

Deleted all unused symbold from drxk_map.h,
which reduced the size from 1.1M to 37K!

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>