msm: kgsl: Update total time at right place for accurate GPU busy

For calculation of busy time and total time, KGSL relies on perf
counters and CPU clock. These can be a bit out of sync and may
give GPU busy greater than 100 percent. Updating time at the right
place will give more accurate total time and will avoid crossing
100% in GPU busy calculation.

Change-Id: I3cc702492325b9dc44ea2b705e4d9014d95abd33
Signed-off-by: Abhilash Kumar <krabhi@codeaurora.org>