config: Ignore i915 gvt guest udev events to avoid crashing

looi requested to merge looi/xserver:fix_gvt into master

i915 sends drm udev events for gvt guests. X running on the host should ignore these events. Currently, the events are treated as actual device add/remove when no such event occurred which causes a crash.

Fixes: #1386 Signed-off-by: Wenli Looi

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