msm: kgsl: Fix gpuaddr_in_range() to check upper bound

Currently gpuaddr_in_range() accepts only the gpuaddr & returns
true if it lies in valid range. But this does not mean that the
entire buffer is within range.
Modify the function to accept size as a parameter and check that
both starting & ending points of buffer lie within mmu range.

Change-Id: I1d722295b9a27e746bfdb6d3bf409ffe722193cb
Signed-off-by: Rohan Sethi <rohsethi@codeaurora.org>