klte-common: Clean up all keylayouts

* Remove unused synaptics, atmel keylayouts.
* Remove invalid keycode from gpio-keys.
  This fixes home wake up option
* Remove invalid keycodes from sec_touchscreen.
* Remove invalid keycodes from sec_navigation.

Change-Id: Iff16b2d54d957a2fb0ea72ef519a69f7157ffd2e