KVM: SVM: Remove a duplicate definition of VMCB_AVIC_APIC_BAR_MASK

KVM: SVM: Remove a duplicate definition of VMCB_AVIC_APIC_BAR_MASK

VMCB_AVIC_APIC_BAR_MASK is defined twice with the same value in svm.h,
which is meaningless. Delete the duplicate one.

Fixes: 391503528257 ("KVM: x86: SVM: move avic definitions from AMD's spec to svm.h")
Signed-off-by: Xinghui Li <korantli@tencent.com>
Reviewed-by: Like Xu <likexu@tencent.com>
Link: https://lore.kernel.org/r/20230403095200.1391782-1-korantwork@gmail.com
[sean: tweak shortlog]
Signed-off-by: Sean Christopherson <seanjc@google.com>