unpackbootimg: Add support for device trees

Change-Id: I340eed99d2274a2f4cbaf5a9f27726ff3a9302e5
adb: Fix backup fallback

 * Check for existence of binary first

Change-Id: I5c1884655ae031f51cb935221ae7870b016e259d
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_system_core into kitkat