drm/msm/sde: rotator software reset during vbif busy case

In some cases regdma timeouts are caused due to vbif busy
and vbif not returing the bus transactions. In such cases
rotator software reset is triggered to avoid panic.

Change-Id: Iad6728a2440961df1d3360b10e07a839931ba200
Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>