Use android standardized charger mode instead of lpm.rc

See http://review.cyanogenmod.org/#/c/77926/

Change-Id: If29e231566f0de16d4bf825df8ee53f719c4f729
Use reduced /system size

To support block-based OTA for users using repartition. May be
reverted in the future.

Change-Id: Ib1c7acde546b791264a0347c9f317aed0b184f26