Revert "Revert "Apply gamma curve to backlight""

This reverts commit b3c09fc5209b5510af5c4cad17a02d21e00cbece.
liblights: remove obsolete code

wtf, this is leftover from the old kernel ALS implementation

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I1c52e0d16af221d3559f302acd2184293d6f9eb0
Update overlays

* Cleanup
* Enable auto-brightness by default

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I551da49402b2dcc1cc02942ef9eb46048ea0660d
msm7x30: update ALS levels

lux values are not precise enough, raw sensor values are multiplied with 12,
that's why we don't have accurate levels.

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I80b8a61c4aa210472f96101891bf061c12e1e52c
Fix ALS overlay derp

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I944c793742e1fc881dace32399fcdcab8ab12e57