hammerhead: Update storage configuration for usbdisk

Fixes mounting of storage connected via USB-OTG

Signed-off-by: kecinzer <kecinzer@gmail.com>
hammerhead: add charging led support

Also introduces led priority handling for
battery vs notification vs attention
(copied from jf-common).

Requires the hammerhead kernel led
always on support patch.

Change-Id: I1a2f3aae457c6d7e4e3c3f9ca39cbe42d39c3bc2
Merge remote-tracking branch 'upstream/kitkat' into kitkat