KVM: SVM: Add svm_ prefix to set/clr/is_intercept()

Make clear the symbols belong to the SVM code when they are built-in.

No functional changes.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Message-Id: <20200625080325.28439-4-joro@8bytes.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>