s4-common: utilize recovery_root_private

Prebuilt modules can be placed in the correct directory structure under
recovery/root and the build system will automatically copy them to the
recovery ramdisk.

Move offmode charging images to devices since they are resolution
dependent.

Change-Id: I36cb2dc104a250c6f63f009b8b78aa1078808927
s4-common: Disable denoise setting for camera

Enabling denoise causes camera to crash. Report that only "off" is
supported so that Camera2 removes the setting.

Change-Id: I6caab1d78cf24cc3b1b2faaa8a9d1b3d4c6e7715
s4-common: Fix wpa_supplicant overlays

The p2p_supplicant service sets up both the p2p and non-p2p interfaces.
We need to associate both overlays in this service (the wpa_supplicant
service actually never runs).

Change-Id: I6dabf1b76c1002493df4e9294f89333b1ec94008