qt5quickcontrols: More deterministic target install

qt5quickcontrols: More deterministic target install

Restrict target install to quickcontrols(1) qmls only.

Installing everything under qml/QtQuick includes e.g. quickcontrols2 if
existent in staging (but not selected). Another issue may arise e.g. for a
external package that creates more files than it installs itself under
qml/QtQuick. In that case, it would depend on the order of the packages how
much gets installed into target.

Signed-off-by: Andreas Naumann <anaumann@ultratronik.de>
Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>