vgsp-rm r579: post the event notifyIndex INDEX field, not the overloaded registration word

THE 2nd-client event-wait root cause (live guest Oops): the NV01_EVENT
registration word we echoed (e.g. 0x3c00000c) is an OVERLOADED field -
cl0005.h: INDEX=bits[15:0], SUBDEVICE=bits[23:16], FLAGS=bits[31:24] - but
the guest's _kgspRpcPostEvent passes the payload's notifyIndex straight to
gpuNotifySubDeviceEvent_IMPL, which indexes its notifier array with it.
Posting 0x3c00000c produced a wild pointer (base + 0x3c00000c*4 + 0x1508)
and a kernel Oops on every dispatched event:

  BUG: unable to handle page fault for address: ffffd04d4235f808
  RIP: gpuNotifySubDeviceEvent_IMPL+0x21f [nvidia]  RAX: 000000003c00000c
  note: victory_matmul[12151] exited with irqs disabled
  Fixing recursive fault but reboot is needed!

The Oops killed the dispatch before osNotifyEvent/nv_post_event (hence the
r576/r577 experiments: records consumed, nv_post_event=0, independent of
sequence/bNotifyList/hClient), dropped every event, and tainted the guest
kernel - clients that needed an event wake (the 2nd-client device-state
spins) wedged. Mask the posted notifyIndex to bits[15:0] (the INDEX field).

Also loadable probe r578: gsp_rm_ev_func (event records carry a
caller-chosen RPC function for reachability tests).

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