Bug#875621: X1 Carbon 6th Gen Trackpad issues

[Duncan Findlay <duncan@duncf.ca>]

I can confirm that recompiling the kernel with CONFIG_RMI4_SMB=m (and only that change) is sufficient to make the Touchpad & TrackPoint usable on the X1 Carbon 6th gen. Without this, it's completely unusable.

This is a regression -- a Debian 9.6 (stretch) live CD does not have this problem with this hardware.

Thanks

Duncan