QQmlPlatform: use QStringLiteral instead of QLatin1String
QQmlPlatform: use QStringLiteral instead of QLatin1String

Change-Id: I83fb44c0bb7d57bc68c6ac54379d5bb0c7ec9715
Reviewed-by: Jake Petroules <2d627e1cecd5435752fa500bacbe05f7cc90c369@petroules.com>
Reviewed-by: Andrew Knight <ccebd4d9fbda4a2105d17b207d80666fa00da2e1@digia.com>

qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative