libgui: Use fences for all QCOM targets

Change-Id: I32d6d8c8c06a2541aa655fb8f2a99c2c0ac0f64b
Don't use fence sync for qcom legacy

Change-Id: Ice64233a25edee763a36a3ba34230d1360a0d610
Add heap configuration for 1080p phones with 2048m

 * Increase heap start size to 16m to minimize GC with larger bitmaps

Change-Id: I8fbba2e5a2a2cf2d7a6898ca6bae8639d6cf5a19