Fix performance issue when enlightenment started.
Fix performance issue when enlightenment started.

Change some logic in ARMSOCDRI2ScheduleSwap(). If src and dst has
same size and they are both no-framebuffer with compositor enabled,
we only need to exchange buffers between src and dst pixmap.

Change-Id: Iba0b3e248589bc8d05f5b52cfb12865790d812a3

Popolon/xf86-video-armsoc,commshare/xf86-video-armsoc,Popolon/xf86-video-armsoc,commshare/xf86-video-armsoc