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
smultron: Fix leds & backlight configuration on boot

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

Change-Id: I03646c48c32fa42659695c94a1fa5871ba425c59