KVM: arm64: nv: Honor MDCR_EL2.HPME

When the PMU is configured with split counter ranges, HPME becomes the
enable bit for the counters reserved for EL2.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241025182354.3364124-16-oliver.upton@linux.dev


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>