mips/r4k: use the new is_vga_init() function

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/hw/mips_r4k.c b/hw/mips_r4k.c
index 2115f7f..967a76e 100644
--- a/hw/mips_r4k.c
+++ b/hw/mips_r4k.c
@@ -281,7 +281,7 @@
         }
     }
 
-    isa_std_vga_init(isa_bus);
+    isa_vga_init(isa_bus);
 
     if (nd_table[0].used)
         isa_ne2000_init(isa_bus, 0x300, 9, &nd_table[0]);