KVM: RISC-V: Use kvm_faultin_pfn() when mapping pfns into the guest

KVM: RISC-V: Use kvm_faultin_pfn() when mapping pfns into the guest

Convert RISC-V to __kvm_faultin_pfn()+kvm_release_faultin_page(), which
are new APIs to consolidate arch code and provide consistent behavior
across all KVM architectures.

Opportunisticaly fix a s/priort/prior typo in the related comment.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-60-seanjc@google.com>