drm_hwcomposer: Add safe guard for unknown connector type

There is potential possibility that new connector type will be added
into DRM and it won't be handled by drm_hwcomposer immediately so it's
better to be safe and report error via logcat than crash with

Signed-off-by: Roman Kovalivskyi <roman.kovalivskyi@globallogic.com>
1 job for fix-connector-name in 29 seconds (queued for 1 second)