bootcontrol: Reduce the number of writes in the set active slot function
am: 2a276b35e0

Change-Id: Ie74bdf8c2797d36d37bb46098d7dbd6375d6bac2
tree: 8a830a985bec3d2ecdb0dad6ccd7ed1fa13d34d9
  1. Android.mk
  2. boot_control.cpp
  3. NOTICE