google/glados: use level trigger for touchpad interrupt

Coolstar's custom touchpad drivers for Windows require level triggering,
and the Linux drivers don't care/perform identically either way. Set
touchpad interrupt to level trigger, matching change made to other
Chromebooks.

Test: boot Windows 10 on google/chell, verify touchpad functional

Change-Id: Id5f145b8b24c04f9c6661710a0cda95f135293e9
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/27550
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
7 files changed