SurfaceFlinger: Change to support framebuffer flip for 2D blitters

- Surfaceflinger does not flip framebuffers when there are
  no layers marked for HWC_FRAMEBUFFER
- This change checks for the HWC_BLIT flag and will request a flip
  to a new FB_TARGET buffer even if there are no FRAMEBUFFER layers

Change-Id: I1cb44389a05c9ec049d7f0d39c288feccb11a91c
SurfaceComposerClient: bring back getDisplayWidth, Height & Orientation

enable it with either ICS_CAMERA_BLOB or MR0_CAMERA_BLOB CFLAG

Change-Id: Ieb5d36ad2a87ed1f0aa28ae3afbd5d48c880d6ab
libgui: Use fences for all QCOM targets

Change-Id: I32d6d8c8c06a2541aa655fb8f2a99c2c0ac0f64b