ANDROID: vendor_hooks: Add vendor hooks for key combination

When some problems happened in android, we can't use adb command because
android can be abnormal state. And we can't use uart because
uart pin is not connected in the board. So we need key combination
functions for debugging.
This function should only use in development environment.
In the market, this will be disabled.

Bug: 167516783

Change-Id: I82e096526b06570b4cc55bf04dc945940d1dd91a
Signed-off-by: Changki Kim <changki.kim@samsung.com>