qt5.inc: Fix packaging of plugins
qt5.inc: Fix packaging of plugins

The qtmultimedia module install the plugins in a sub-directory however
those were not being packaged. This patch fixes following QA error:

ERROR: QA Issue: qtmultimedia: Files/directories were installed but not shipped
  /usr/lib/qt5/plugins/video
  /usr/lib/qt5/plugins/video/videonode
  /usr/lib/qt5/plugins/video/videonode/libimx6vivantevideonode.so
  /usr/lib/qt5/plugins/video/videonode/.debug
  /usr/lib/qt5/plugins/video/videonode/.debug/libimx6vivantevideonode.so

Reported-by: Lauren Post <dca2413c495ae6005f2a28d17f0b8afe808fe61f@freescale.com>
Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

schnitzeltony/meta-qt5,timopulkkinen/meta-qt5,jruffin/meta-qt5,sapiippo/meta-qt5,timopulkkinen/meta-qt5,opendreambox/meta-qt5,Ivan-SB/meta-qt5,timopulkkinen/meta-qt5,Tofee/meta-qt5,Ivan-SB/meta-qt5,kraj/meta-qt5,cjp256/meta-qt5,Tofee/meta-qt5,cjp256/meta-qt5,opendreambox/meta-qt5,schnitzeltony/meta-qt5,jruffin/meta-qt5,meta-qt5/meta-qt5,sapiippo/meta-qt5,meta-qt5/meta-qt5,opendreambox/meta-qt5,kraj/meta-qt5,timopulkkinen/meta-qt5