Compile vmware_vga only once

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/mips-softmmu.mak b/default-configs/mips-softmmu.mak
index 759d123..a4e1222 100644
--- a/default-configs/mips-softmmu.mak
+++ b/default-configs/mips-softmmu.mak
@@ -5,6 +5,7 @@
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
 CONFIG_VGA_ISA_MM=y
+CONFIG_VMWARE_VGA=y
 CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y