qt53d: install missing QML modules, plugins and examples

qt53d: install missing QML modules, plugins and examples

Some files were missing on the first build of qt53d but added later:
- by qt5base for the plugins because it copies the whole /usr/lib/qt/plugins
  directory
- by qt5declarative for the QML modules because it copies the whole
  /usr/qml directory

Also, the qt53d examples were not installed if
BR2_PACKAGE_QT5BASE_EXAMPLES was set.

Signed-off-by: Romain Reignier <rom.reignier@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>