isa-vga: Make available with -device, like the other VGA qdevs

Switch no_user off and make it suppress the default VGA.

Signed-off-by: Markus Armbruster <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>
diff --git a/vl.c b/vl.c
index 11f6386..04b4a20 100644
--- a/vl.c
+++ b/vl.c
@@ -289,6 +289,7 @@
     { .driver = "VGA",                  .flag = &default_vga       },
     { .driver = "cirrus-vga",           .flag = &default_vga       },
     { .driver = "vmware-svga",          .flag = &default_vga       },
+    { .driver = "isa-vga",              .flag = &default_vga       },
 };
 
 static int default_driver_check(QemuOpts *opts, void *opaque)