overlay: remove overlay only including reboot-actions

Change-Id: I8035e9cbc039d5c7b31c1c98df7b22930ff20bf5
Revert "omap4-common: enable swapping to zram"

Disable zram for now, until backported from 3.13.

This reverts commit eeb0af687e8fe3ea72e13eef6b677b1a910f42c7.

Conflicts:
	root/fstab.mapphone_cdma
	root/fstab.mapphone_umts

Change-Id: Ib9858c1c88410995bad778066bc7452e782e0b0a
overlay: disable a few not yet supported options

Change-Id: Ia96bb1167a9396e25e09c511127ff96081c62b75
overlay: enable ambient mode

Change-Id: I5df58a0194b42223bed7a8546edfac461b02fbdb