KVM: arm64: Factor out pKVM hyp vcpu creation to separate function

Move the code that creates and initializes the hyp view of a vcpu
in pKVM to its own function. This is meant to make the transition
to initializing every vcpu individually clearer.

Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20250314111832.4137161-4-tabba@google.com


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