msm: kgsl: Limit the syncpoint count for AUX commands

KGSL internally has a limit on the length of the list of syncpoints
submitted in a single AUX command. Enforce this limit so we don't
overwrite memory beyond the structures that track these syncpoints.
(cherry picked from commit 1e46e81d)

Change-Id: I261bfd4f786ff7e4fbe07e8bca9e9b8d8b87c950
Signed-off-by: Sahitya Puligadda <quic_spuligad@quicinc.com>