Keys: fix key layout typo, better compliance with AOSP

References:
http://source.android.com/tech/input/keyboard-devices.html
http://developer.android.com/reference/android/view/KeyEvent.html

1) synaptics-rmi-touchscreen: buildIn typo
2) tv-touchscreen: assign key 250 an AOSP recognized android key code

Change-Id: I6de2d52d9c270c860d24ceaee09ff1da05c4c653
Release tag

Change-Id: I93c9adefeaef87a9bc18716ea08690315b73c009