msm: Configure UCHE GMEM base address based on GMEM size

Different ASIC can have a different GMEM size so need to configure
a UCHE GMEM base address accordingly.

Change-Id: I97e70e5ef36374cf9f0bff88613e9f3f940ff846
Signed-off-by: Thomas (Wonyoung) Yun <wyun@codeaurora.org>