media: ttpci: use rc-core for the IR receiver

The IR protocol can now only be set via the rc protocols sysfs file rather
than via module parameters or a custom procfs file. So, it is no longer
necessary to periodically check for protocol changes.

The IR_RCMM protocol does not decode the Philips RC-MM protocol (12, 24 or
32 bit variants) or any protocol rc-core can encode, so this is marked
RC_PROTO_UNKNOWN.

Tested on Technotrend/Hauppauge WinTV Nexus-S rev2.1, which comes
with a small black hauppauge remote.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>