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
Do not just silently fail if surface creation fails

Some apps do not check if they actually got a surface (e.g. bootanimation)
So this helps the track crashes down to the cause.

Change-Id: I6e74bdb52ad7ebe260b0ec1777c585781f6bbd42