Switch to Mms-caf

Change-Id: Ic3d143c4304f17a2aea3ce43b19214641ade13ad
Enable FFMPEG and Stagefright plugins

Change-Id: Ia41715481d70040f9aa53c2a1cd080758ef4e96f
Add Gmock

Change-Id: I047d6cfae642be3b6d71b2fb29a265f9338d7ad9