msm: kgsl: Correct the number of cmds added for cmdbatch profiling

We would allocate space for 6 cmds if cmdbatch profiling was
enabled. That number changed to 4 with the use of the
RECORD_PFP_TIMESTAMP cmd.

Change-Id: Ide92e2c84cb22775376cb753c82bc78f4900c533
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>