meta-raspberrypi has changed to using vc4graphics, which support kms.
Remove BBMASK from meta-raspberrypi qt5 recipe append and those can
now be used to make the needed changes for the integration plugin.
RPI enables examples for qtbase, disable them for all our builds.
Remove use of QT_GSTREAMER_USE_OPENGL_PLUGIN as it does not work.

Change-Id: I3ab2a4b423141e404addc1c6a63a358fe80b8ad0
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>

Use of QT_GSTREAMER_USE_OPENGL_PLUGIN broke video playback
at least on imx6 and imx8 boards. Move the option for now
to raspberrypi only, since that's were the original issue
was reported.

Task-number: QTBUG-78855
Change-Id: I28fc98bcdac3ca02af07bbdb0466daa9c4612df3
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>

Instead of having additional meta layers, include the bbappends
dynamically whenever the corresponding layer is used.

Change-Id: I30f62ada645d9bf0e2a4aee9ca4db4144a6ccb83
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>