flo: Add Webkit flags

Change-Id: Ie584d13da0bb6d6a69c55cde308ceae8fc2eff7e
flo: Enable use of CAF driver variants

 * Lots of kernel updates to support this
 * Improved performance, better power consumption, added features

Change-Id: Ic7956c0aefb91d8a164f1285e1254fc534b53a2f
flo: Use retire fence from MDP driver

Change-Id: I29eecfa7a007dc4b798d43f4bff002500807a356