msm: kgsl: Expire MARKER commands even inflight is full

If inflight queue is full and command batches are taking longer time
for completion there is a possibility of holding the MARKER commands
in context queue for longer duration, though marker command and the
dependent timestamp are retired.

CRs-Fixed: 828303
Change-Id: I9f9cf88eb34d128ea0a0ded057c3a6d0fa86d66d
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>