msm: mdss: Remove init phase programming

Init phase should only be programmed to a non zero value only through
a user program. Default value of zero is programmed by the driver to
avoid hardware hangs

Change-Id: Iff99394d2f3a937c5bb4456c2f7ca5669a5c732b
Signed-off-by: Sree Sesha Aravind Vadrevu <svadrevu@codeaurora.org>