q35: Add support for SGX EPC

Enable SGX EPC virtualization, which is currently only support by KVM.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210719112136.57018-21-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/i386/pc_q35.c

@@ -177,6 +177,7 @@ static void pc_q35_init(MachineState *machine)
         x86ms->below_4g_mem_size = machine->ram_size;
     }
 
+    pc_machine_init_sgx_epc(pcms);
     x86_cpus_init(x86ms, pcmc->default_cpu_version);
 
     kvmclock_create(pcmc->kvmclock_create_always);