wacom: Use WaitForDevice() to make sure devices are added
wacom: Use WaitForDevice() to make sure devices are added

Generate events for stylus motion.

freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests,freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests,freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests