project: msm8952: Add compilation flag for backward compatible verified boot

Verified boot flow has changed in android M, for the backward compatibility
compilation flag is defined which will follow L-MR1 verified boot flow.
This flag will be enabled for OTA upgrades which do not have partition
changes in place.

Change-Id: Ibb7dea05a3ccfac02922024b8064c35fd1506809
1 file changed