Compile fdc only once

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
index 2bdf957..9691401 100644
--- a/default-configs/ppc-softmmu.mak
+++ b/default-configs/ppc-softmmu.mak
@@ -7,6 +7,7 @@
 CONFIG_M48T59=y
 CONFIG_VGA_PCI=y
 CONFIG_I8254=y
+CONFIG_FDC=y
 CONFIG_IDE_QDEV=y
 CONFIG_IDE_PCI=y
 CONFIG_IDE_ISA=y