Properly support Librem 13 v2 and v3 keyboard (udev hwdb rules)
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On the librem 13 v2 and v3, the scancode 56 should be mapped to keycode 43 (backslash), I have a fix in place locally that I pulled from the purism forums: https://forums.puri.sm/t/keyboard-layout-unable-to-recognize-pipe/2022/10

Basically I override the current keyboard udev rules with my own in /etc/udev/hwdb.d/90-keyboard.hwdb

evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism:pnLibrem13v2*
 KEYBOARD_KEY_56=backslash

Here's my Librem 13v3's /sys/class/dmi/id/modalias

dmi:bvncoreboot:bvr4.7-Purism-3:bd03/02/2018:svnPurism:pnLibrem13v2:pvr2.0:rvnPurism:rnLibrem13v2:rvr2.0:cvnPurism:ct9:cvr:

side note: it's weird that the v3 is actually called the v2 version 2. It threw me off when I first got this machine.

In my Librem 13v3 /sys/class/dmi/id/modalias contains

dmi:bvncoreboot:bvr4.7-Purism-4:bd03/20/2018:svnPurism:pnLibrem13v3:pvr3.0:rvnPurism:rnLibrem13v3:rvr3.0:cvnPurism:ct9:cvr:

thus /etc/udev/hwdb.d/90-keyboard.hwdb contains

evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism:pnLibrem13v2*
 KEYBOARD_KEY_56=backslash

Seems like something we need to ship as part of solus-hardware-config