Add support for external dock batteries

Allows the external battery status to be read via framework.

Change-Id: I1340071cecab8f1733e58e4f3ba0d304f861f311

Conflicts:
	services/jni/com_android_server_BatteryService.cpp
frameworks: base: add storage_sd_dock_card string

* For Asus dock sdcards.

Change-Id: Ibe6336d4073e8e4f6c357b47bd980526a6789040
Show dock battery level if available

Updated for Jellybean.

Change-Id: Iabfd12eb327a9fe32ffa46eea5c9038263e105a9
frameworks: add dock battery drawables for HDPI devices

Change-Id: I8cc2cfc74548693ffbdd48447d7fa414fd451f59
Cleanup dock battery support

Send an intent as soon as the device is undocked to get a timely update
of the SystemUI.

Adds a proper implementation of dock detection in BatteryService via
"dock_battery/device/ec_dock". This will probably have to be rewritten
in a more generic way to support other manufacturers as well (once we
support other docks at all).

Change-Id: Ib1088c118c8695fd93ba085d976ca1eb374ae71e

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/DockBatteryController.java

Conflicts:
	services/jni/com_android_server_BatteryService.cpp