disp: msm: sde: retain ubwc settings during LA to LE transition

Setting hbb value based on the ddr type of the target is
not supported in trusted vm environment. Add changes to
retain the ubwc configuration programmed by LA during the
transition to LE environment.

Change-Id: I1fa308ea99f815cfe4d1c75a22dbb6f89a806007
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>