disable block based flashing for testing

* block based flashing causes a few headaches during bringup
because it doesn't allow for dirty flashing between builds.

* This also returns to the old zip package structure instead of
the .dat files

Change-Id: I6990598775c2ed1d3dd8728ba68303cd69d74c7b
(cherry picked from commit 6dbb04ee02d8887b84cd906d4761c53b1d34abf7)