bootcontrol: Add initial support am: 9304a899df am: 32b42cc1a9
am: 81802e3278

Change-Id: I544b4f6ae128c5c7593c7c858bce4a5089cdc7c6
tree: 0b8683ab5a13b8e34d8206fa3afc8b48287acbea
  1. bootctrl/
  2. libhwcomposer/