msm: kgsl: Check the address range before mapping to GPU

Validate the GPU address range for memory mapping request
for user allocated buffers before setting the bitmap.

This is applicable to the memory mapping specifically
when user have used USE_CPU_MAP flag.

Change-Id: I7fd30789329939f89b5486d59bdee920616cc6df
Signed-off-by: Sunil Khatri <sunilkh@codeaurora.org>