smultron: 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: I7f5d232e93fdace2e8ad13f18704165418ed4243
Merge "smultron: Remove obsolete ALS configuration" into jellybean