Now that the read_ctr macro has been specialised for nVHE,
the whole CPU_FTR_REG_HYP_COPY infrastrcture looks completely
overengineered.

Simplify it by populating the two u64 quantities (MMFR0 and 1)
that the hypervisor need.
Reviewed-by: NQuentin Perret <qperret@google.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>