xen/arm and xen/arm64: implement HYPERVISOR_tmem_op

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
diff --git a/arch/arm/xen/hypercall.S b/arch/arm/xen/hypercall.S
index 199cb2d..d1cf7b7 100644
--- a/arch/arm/xen/hypercall.S
+++ b/arch/arm/xen/hypercall.S
@@ -88,6 +88,7 @@
 HYPERCALL2(memory_op);
 HYPERCALL2(physdev_op);
 HYPERCALL3(vcpu_op);
+HYPERCALL1(tmem_op);
 
 ENTRY(privcmd_call)
 	stmdb sp!, {r4}