KVM: SVM: Update max number of vCPUs supported for x2AVIC mode

xAVIC and x2AVIC modes can support diffferent number of vcpus.
Update existing logics to support each mode accordingly.

Also, modify the maximum physical APIC ID for AVIC to 255 to reflect
the actual value supported by the architecture.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-5-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>