drm/msm: Fix gmem range setting

GMEM IOVA range is intended to start from 0x100000. But currently
it is initialized with RANGE_MIN_LO:RANGE_MIN_LO. It makes GMEM
IOVA start from 0.

Change-Id: Ib3c9a86d0cd85794881d8708386b18d58bd8e58e
Signed-off-by: Kasin Li <donglil@codeaurora.org>