msm: kgsl: Add user command profiling with hw scheduling

User mode specifies a profiling buffer as part of the ib list.
This ib is passed on to the GMU as part of the HFI packet to issue
commands. The GMU will in turn create a special user profiling IB
to have the GPU write the command start and retire ticks into the
user specified buffer. The submit to HFI time is recorded in the
user specified buffer by kgsl.

Change-Id: I800b4a23876f6f0707fb7a942e97d70a2d712aeb
Signed-off-by: Sushmita Susheelendra <ssusheel@codeaurora.org>
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>