msm: sde: Disable client driven prefetch for rotator

QOS bit for CDP is not set for sdm660 and msm8998 but
still CDP is enabled, as default value of register keeps
it enabled. Disable the default bit in register if CDP
is disabled.

Change-Id: If8c43642c44c3e1613ce3fe088622ac8c73795f0
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>