KVM: x86: Select TDX's KVM_GENERIC_xxx dependencies iff CONFIG_KVM_INTEL_TDX=y

KVM: x86: Select TDX's KVM_GENERIC_xxx dependencies iff CONFIG_KVM_INTEL_TDX=y

Select KVM_GENERIC_PRIVATE_MEM and KVM_GENERIC_MEMORY_ATTRIBUTES directly
from KVM_INTEL_TDX, i.e. if and only if TDX support is fully enabled in
KVM.  There is no need to enable KVM's private memory support just because
the core kernel's INTEL_TDX_HOST is enabled.

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Message-ID: <20250729225455.670324-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>