msm: kgsl: Store the profiling buffer gpuaddr as a uint64_t

The GPU address of the profiling buffer is stored in the command
batch struct and like all GPU addresses throughout the universe
it should be typed as a uint64_t.

Change-Id: Ic0dedbadf8694ff2e5247ef2112ddd699b53612b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>