Device 368b:8d84 is an AIC 8800D80 variant not included in the USB
device table. Add it as AIC8800M80_CUS0 alongside the other M80 CUS
variants; it maps to PRODUCT_ID_AIC8800D81 like its siblings.
Tested on kernel 6.19.8-arch1 with a physical dongle (Bus 001 Device
005: ID 368b:8d84 AICSemi AIC 8800D80).
