[Bug 791374] kmssink: fix kmssink fail to start when not connect display

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791374

--- Comment #1 from Haihua Hu <jared.hu at nxp.com> ---
Created attachment 365228
  --> https://bugzilla.gnome.org/attachment.cgi?id=365228&action=edit
kmssink: fix kmssink fail to start when not connect display

Get display connected status from drm connector, drop all buffer when display
not connected

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