msm: kgsl: Override UBWC configuration for A660 based on DDR type

The highest bank bit defined in the A660 gpucore structure defaults
to DDR type 8. If underlying DDR is type 7, then modify the highest
bank bit accordingly.

Change-Id: Idd36f69227dca63eef19c1ac1843b88982346edd
Signed-off-by: Raghu Ananya Arabolu <rarabolu@codeaurora.org>