Deploy Qt Quick 2 imports to device as well

Qt Quick 2 imports are installed to $QTDIR/qml instead of
$QTDIR/imports. We have to make sure they are available
on the device in order to use Qt Quick.

Change-Id: Iaa3e429f6706a5e200d5a1672b63059ddf39e770
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>