ssb: Implement SDIO host bus support

Add support for communicating with a Sonics Silicon Backplane through a
SDIO interface, as found in the Nintendo Wii WLAN daughter card.

The Nintendo Wii WLAN card includes a custom Broadcom 4318 chip with
a SDIO host interface.

Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/ssb/Makefile b/drivers/ssb/Makefile
index cfbb74f..656e58b 100644
--- a/drivers/ssb/Makefile
+++ b/drivers/ssb/Makefile
@@ -6,6 +6,7 @@
 # host support
 ssb-$(CONFIG_SSB_PCIHOST)		+= pci.o pcihost_wrapper.o
 ssb-$(CONFIG_SSB_PCMCIAHOST)		+= pcmcia.o
+ssb-$(CONFIG_SSB_SDIOHOST)		+= sdio.o
 
 # built-in drivers
 ssb-y					+= driver_chipcommon.o