SurfaceFlinger: Invalidate HWC Geometry on buffer validity change

HWC layer's flags and properties need to be updated whenever the
properties of the layer change. This change adds support to update
the flag when layer's buffer validity changes.

CRs-Fixed: 334664

Change-Id: Ia785f58c8d89ebd18867c78d93f1733c82694435
(cherry picked from commit 242fc135f91e6967d0a37f6de78e6090643fa35d)