drm/msm/sde: disable fast clear bit for ubwc with no alpha

As per HW recommendation disable fastclear bit for
ubwc format with no alpha for ubwc version 2.0

Change-Id: Ia62610d79ea8ea453bb08fde36473a49432dad66
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>