msm: Fix UCHE to GMEM VA align and SVM base addr

UCHE to GMEM access requires 1MB alignment and SVM base
address for 32bit needs to be updated based on UCHE GMEM
size.

Change-Id: I8ccf3abbaaac4ca830d4e36c70af89654d1a989e
Signed-off-by: Thomas (Wonyoung) Yun <wyun@codeaurora.org>