coconut: Remove obsolete ALS configuration

Also set button_backlight current on pre_hw_config.sh to avoid too bright recovery indication.

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

Change-Id: If1f48e730afc0b4897fd4407edc02ab6304bd616
Merge "coconut: Remove obsolete ALS configuration" into jellybean