QGenericMatrix<N,M,T>: mark as relocatable, depending on T

Inherit the type-classification from the underlying type,
but, for BC reasons, force isStatic = true, so QList does
not change its memory layout in an incompatible way.

Change-Id: I11003cdd24968f903fbd86aa2f5c17287e057c1f
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>