msm: mdss: Ensure mdp splash cleanup before initiating rotation request

If rotation request comes when MDP is operating on physical address
then fail the request such that composition can fall back onto GPU.
Allow HW rotation when MDP switches to Virtual address access.

Change-Id: Id8762a011ab3d991527a87cb70cd48877820792f
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>