nx2: give each vi2 event slot its own source

vi2 31 hands out one event per slot (index < 8, picked by the sdk from a
free bitmap), and 261..272 bind a slot to a display event source or unbind
it: 261 vsync; 263, 265, 267, 269 and 271 the refresh rate, HDR status, HDR
paper white, buffer max resolution and mode capability change
notifications. Every slot used to be a fresh 60 Hz vsync event and the bind
commands were auto stubs, so change events fired on every vblank and games
re-queried 103/104/105 every frame (Kirby Air Riders rebuilt its window
images whenever its HDR status event fired).

Slots now fire on vblank until bound; a change binding fires once and then
stays quiet, since nothing here changes. 32 carries a handle descriptor and
the client's handle before the index; it returns that slot's event (games
call it for the vsync slot, which title 1 waits on before its first frame).

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