[Bug 796470] vaapidisplay: remove calling gst_vaapi_display_new in each descendant.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796470

--- Comment #3 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 372502
  --> https://bugzilla.gnome.org/attachment.cgi?id=372502&action=edit
libs: display: replace calling gst_vaapi_display_new with 
gst_vaapi_display_create method

Gobjectification for GstVaapiDisplay was almost done by the commit 185da3d1.
But still something breaking GObject code convention remains, which is
calling gst_vaapi_display_new in each decendants.

This patch replaces it with gst_vaapi_display_create, defined in private
header.

In addition, this patch avoids duplicate calls of VAInitialize in case of
GstVaapiDisplayEGL.

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