Only compile sd when one target uses it

Patchworks-ID: 35208
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

Makefile

@@ -105,7 +105,8 @@ obj-y += scsi-disk.o cdrom.o
 obj-y += scsi-generic.o scsi-bus.o
 obj-y += usb.o usb-hub.o usb-$(HOST_USB).o usb-hid.o usb-msd.o usb-wacom.o
 obj-y += usb-serial.o usb-net.o usb-bus.o
-obj-y += sd.o ssi-sd.o
+obj-y += ssi-sd.o
+obj-$(CONFIG_SD) += sd.o
 obj-y += bt.o bt-host.o bt-vhci.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o usb-bt.o
 obj-y += bt-hci-csr.o
 obj-y += buffered_file.o migration.o migration-tcp.o net.o qemu-sockets.o

default-configs/arm-softmmu.mak

@@ -6,3 +6,4 @@ CONFIG_ISA_MMIO=y
 CONFIG_NAND=y
 CONFIG_ECC=y
 CONFIG_PTIMER=y
+CONFIG_SD=y