xen: Rename XENBACKEND_DEVICE to XENBACKEND

Make the type checking macro name consistent with the TYPE_*
constant.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20200902224311.1321159-58-ehabkost@redhat.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

include/hw/xen/xen-legacy-backend.h

@@ -11,7 +11,7 @@
 #define TYPE_XENBACKEND "xen-backend"
 
 typedef struct XenLegacyDevice XenLegacyDevice;
-DECLARE_INSTANCE_CHECKER(XenLegacyDevice, XENBACKEND_DEVICE,
+DECLARE_INSTANCE_CHECKER(XenLegacyDevice, XENBACKEND,
                          TYPE_XENBACKEND)
 
 /* variables */