msm: kgsl: Update required timestamps during command submission

Update all the required timestamps when submitting commands to the
GPU ringbuffer for execution. The global timestamp was not being
updated in all the required cases. Now the global timestamp and
per context timestamp are updated if following conditions are met:
	1. A valid non global context is passed
	2. The context passed supports per context timestamps
	3. The command submission is not from kgsl
If 3 conditions above are not met then only the global timestamp is
updated.

Change-Id: Ib4fe6fbd2ac57fbc5306377f09072f9e4c09d442
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>