This is the same as SMX_SetLights, but instead of taking one buffer with a
fixed size, it takes a separate buffer for each pad, and explicitly includes
the size of the buffer rather than assuming it's 864 bytes. SMX_SetLights
and SMX_SetLights2 call into the same underlying update.
This caused SMXConfig to think it was setting both controller configurations even
when only one was connected, which made the UI not refresh correctly if only P2
was connected.
Glenn Maynard