tools: libxendevicemodel: Restore symbol versions for 1.0

In 1462f9ea8f
"tools: libxendevicemodel: Provide xendevicemodel_shutdown"
we added a new version 1.1 to the symbol map and simply abolished
the old one.  That is quite wrong.

Instead, we should have left the 1.0 map alone and added a new version
which simply adds the new symbol.

Fix this.

Reported-by: Ross Lagerwall <ross.lagerwall@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Reviewed-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

tools/libs/devicemodel/libxendevicemodel.map

@@ -1,4 +1,4 @@
-VERS_1.1 {
+VERS_1.0 {
 	global:
 		xendevicemodel_open;
 		xendevicemodel_create_ioreq_server;
@@ -18,8 +18,12 @@ VERS_1.1 {
 		xendevicemodel_modified_memory;
 		xendevicemodel_set_mem_type;
 		xendevicemodel_inject_event;
-		xendevicemodel_shutdown;
 		xendevicemodel_restrict;
 		xendevicemodel_close;
 	local: *; /* Do not expose anything by default */
 };
+
+VERS_1.1 {
+	global:
+		xendevicemodel_shutdown;
+} VERS_1.0;