KVM: x86: Use new is_noncanonical_address in _linearize

[ Upstream commit 4be4de7ef9fd3a4d77320d4713970299ffecd286 ]

Replace the current canonical address check with the new function which is
identical.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>