Revert "Apply gamma curve to backlight"

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

Change-Id: I54c1743aea3c819d90421aca8bc7e63891f1d1b4
Revert "msm7x30: update ALS overlay for new liblights"

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

Change-Id: Ie425ae847ecc6bfd6e303661421e420e80f2439c