hwc: Don't use MDP for buffers of width less than 5

This is a software workaround for MDP hardware limitation where
DSI mode panels wont give more than 30 FPS if buffers in RGB
pipes are of width less than 5

MDP can't handle layers of width less than 3. Fail MDP
Composition for those frames.

Change-Id: If45efab19817ea9e724fd2857fcc1c5d98ce0eab
2 files changed