msm: kgsl: Prevent recursion when dumping sync fence logs

Attempt to detect recursion in the sync fence logging mechanism
whereby a syncpoint is waiting for a fence that ends up waiting for
the same context that owns the syncpoint.

CRs-Fixed: 744197
Change-Id: Ic0dedbadb4207ad5823f882b20007914bd80c391
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>