Skip roach detachable devices during firmware update

Roach device is a detachable keyboard + touchpad that show up on the i2c
bus instead of the traditional usb bus. They are still handled by hammerd
and thus should be no-op for touch-firmware updater.

BUG=b:333986673
TEST=FEATURES=test emerge-${B} chromeos-base/touch_updater
TEST=Manual validation on ciri, starmie and eve

Change-Id: Id51c2229170d8493662082c67cfe90198cab3a08
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touch_updater/+/5528564
Tested-by: Henry Barnor <hbarnor@chromium.org>
Commit-Queue: Henry Barnor <hbarnor@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
1 file changed