msm: mdss: optimize MDP pipes cleanup

There are cases where pipe cleanup can happen without display commit.
This means that the pipe was never programmed to hardware, in these
cases the pipe can be cleaned up without the need of display commit
cycle to happen. Also there is no need to access hardware to release
resources such as SMPs since they have not been programmed yet.

Change-Id: I57a46471dc1fba4e45e55c3543940ba4fba0540a
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>