KVM: arm64: nVHE: Pass pointers consistently to hyp-init

Rather than some being kernel pointer and others being hyp pointers,
standardize on all pointers being hyp pointers.

Signed-off-by: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200915104643.2543892-15-ascull@google.com