- fixed missing buttons in keymap.

- make function names & descriptions more generic,
  since this same ir receiver and remote is used in
  many FusionHDTV products.

- miscellaneous cleanups.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>