Implements Hdmi Cec keycode translater

In order to transfer some keyevent to other device
we need to have a logic to translate Android keycode
to Hdmi CEC keycode and vice versa.
HdmiCecKeyTranslater handles bidirectional keycode translation.
Basically it assumes bijection between android key code to
a pair of cec keycode and its optional param.
KeycodeEntry of HdmiCecKeycodeTranslate handles a mapping of it.

Note that all available mappings have no parameterized mapping.
If new Android keycode is defined for parameterized cec keycode,
entry should be added.

Change-Id: I287082a0a6ef5eb6f0916044b78179fe3fdfbece