GitLab

Move the permission checking code to checkBinderPermission and
checkBinderPermissionOrSelf target to simplify permission checking code
and clean up keystore methods. Also adds
checkBinderPermissionAndKeystoreState as a helper method to check the
permission and the unlock state of the keystore.

Change-Id: I77c94af1593d2a7fd100c79a6364583067ffa559