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.

Change-Id: I261bfd4f786ff7e4fbe07e8bca9e9b8d8b87c950
Signed-off-by: Lynus Vaz <quic_lvaz@quicinc.com>
Signed-off-by: Kaushal Sanadhya <quic_ksanadhy@quicinc.com>