nvservices: mitigate abort with heavy load on the GPU processing thread (#1173)

* nvservices: mitigate abort with heavy load on the GPU processing thread.

This should fix Mario Tennis and LM3 regressions with syncpoints.

NOTE: Mario Tennis seems to have another issue related to the texture
cache that happens randomly when starting a match.

PS: Also add a debug logger for all known ioctl call to facilitate
debugging and add a missing UpdateMin in EventSignal.

* Address LDj3SNuD's comment

* Address gdkchan's comment

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