This CL also removes wait_for_strongbox, which is broken because it
looks only for keymaster implementations, not keymint. But it's also
unnecessary due to reorganization of the way keystore and vold start
up.
Bug: 177729159
Test: boot & VtsAidlKeyMintTargetTest
Change-Id: I6c5210356396b2079e036e94bb909f3a1a31e6c6
Bug: 179527556
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Test: device boot and examined logs to make sure no errors related to
missing power stats 1.0
Change-Id: Ib8cc394f9968edaf948a2d9700e9f7fcaa5b9dc0