tst_qmltc::listView() is flaky under qemu

Looks like usual stuff with QEMU:

agent:2021/12/20 17:20:56 build.go:394: 34: FAIL! : tst_qmltc::listView() Compared values are not the same
agent:2021/12/20 17:20:56 build.go:394: 34: Actual (model->count()): 0
agent:2021/12/20 17:20:56 build.go:394: 34: Expected (1) : 1
agent:2021/12/20 17:20:56 build.go:394: 34: Loc: [/home/qt/work/qt/qtdeclarative/tests/auto/qml/qmltc/tst_qmltc.cpp(1590)]

First encountered in https://testresults.qt.io/logs/qt/qtdeclarative/b8a855ccea311f5a5afc1241a073d46672e61153/LinuxUbuntu_20_04x86_64LinuxQEMUarmv7GCCqtci-linux-Ubuntu-20.04-x86_64-50-ba37a9Sccache/6950d2d9c038d353e8c94189a9e673c4d39e6f47/test_1640018617/log.txt.gz
during submodule update for 6.3.