KVM: SVM: Remove check if APICv enabled in SVM update_cr8_intercept() handler

This check is unnecessary as x86 update_cr8_intercept() which calls
this VMX/SVM specific callback already performs this check.

Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>