media: rc: Add support for RC6 philips IR remote control keymap

RC6 philips remote control uses RC6 protocol to send the user
control data through IR.

Change-Id: I53f93c679c08a2b2aca154a761f84dae2f1c52e9
Signed-off-by: Ravi Kumar V <kumarrav@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>