mkqt5bld: qtquickcontrols added to essentials list

Task-number: QTBUG-31718
Change-Id: I54aaea3e64e9a96b13b813492e7af1e6ea1b0f75
Reviewed-by: Caroline Chao <caroline.chao@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>