vgsp-sema: ack the class-2d IMMD NOTIFY from the X DDX sync

The X server's nvFermiSync queues the class-2d completion as
IMMD_DATA methods (SET_NOTIFY_A/B + NOTIFY 0x10c WRITE_ONLY). The
run-shaped watchdog form was already handled; the IMMD form fell
into the default case, so the zeroed NvNotification was never
authored and the server spun in WAIT (0,8,0x8000,...) with the
status left IN_PROGRESS. Handle the IMMD form and treat the 0x8000
IN_PROGRESS status as armed in the keepalive scan. The mode-set
then completes and the 2D sync acks (verified on the emulated
vGPU: no WAIT, sema-notify2d zeroed). The A/B knob
sema_2d_notify_immd=0 restores the old dropped-NOTIFY behaviour.

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