hallon: Remove obsolete ALS configuration

Fix keyboard recovery indication
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: I60d879807c5e091de7b15ffa4dc63cdf3e983ed2
hallon: Fix leds & backlight configuration on boot

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

Change-Id: I7deab3f4e43e99843dc34a2dd7baf3c572c48737