WIP: Support Synaptics touchpad

[Aaron Bieber]

Hi 

I am running the synaptics patch on -current amd64. Seems to be running
great! 

dmesg:
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
wsmouse1 at pms0 mux 0

I have touchpad+trackpoint enabled on a lenovo t410 

Cheers,
Aaron