There were two problems here:
* The 'vssconfig' files need to be removed so the displays are
auto-configured directly.
* Fix a problem with a missing library. The code tries to 'dlopen' a
shared library using the symbolic link instead of the soname. But the
symbolic link is only installed with the development package PN-dev,
so it's not available with the normal 'gst-fsl-plugin' package. Added
patch that fixes this problem.
https://jira.digi.com/browse/DEL-167
Signed-off-by: Javier Viguera <javier.viguera@digi.com>