msm: kgsl: Configure UBWC correctly for LPDDR3 on A610

Both LPDDR3 and LPDDR4x are supported for A610 GPU. LPDDR3
has multiple different highest bank bit values based on
different DDR density. This change adds support to query
highest bank bit value from device tree for LPDDR3 parts
and program it accordingly. This is needed to ensure that
UBWC is configured properly for all supported DDR type.

Change-Id: Ife3156e6d7db40e84cf3c22b71de08fae4f31818
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>