psm(4): Always initialize Synaptics touchpad report range with defaults

Otherwise libinput refuses to recoginize some Synaptics touchpads with
"kernel bug: device has min == max on ABS_X" message in Xorg.log.

PR: 251149
Reported-by: Jens Grassel <freebsd-ports@jan0sch.de>
Tested-by: Jens Grassel <freebsd-ports@jan0sch.de>
MFC-after: 2 weeks