Qt QML issue with ARM aarch64 virtual addressing

There is an issue in Qt QML with the ARM64 AArch64 architecture when virtual addressing (VA) pointers use 48 bits. The details are described in the Qt bug tracker issue # QTBUG-54822.

The short term workaround is to reduce the number of VA bits in the kernel config.

The Qt ticket says it was fixed in Qt 5.6.3, but GDP-11 uses Qt 5.6.0. It would therefore be good to update to 5.6.3.

I thought that might be a straight forward update to the latest release of the meta-qt5 layer, however the Krogoth branch uses 5.6.2. The principal question is therefore how best to integrate the fix.