msm: mdss: Reset pipe's mfd parameter during pipe free

There is a corner case with dma pipe. If its set call
fails as line mode (for mdp) and is configured
subsequently as block mode (for rotation), mfd parameter
of the dma pipe structure does not get reset during set
failure cleanup. This causes unnecessary force dma
cleanup call in rotatorp lay which gets hang and
results in rotator fence timeout.

Change-Id: Ia090e9eebf43ab6e28a2746f8fe57e2c3da34e59
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>