mfd: Add MODULE_DEVICE_TABLE to rdc321x-southbridge

The device table is required to load modules based on modaliases.
After adding MODULE_DEVICE_TABLE, below entry will be added to modules.pcimap:
rdc321x-southbridge  0x000017f3 0x00006030 0xffffffff 0xffffffff 0x00000000 0x00000000 0x0

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/rdc321x-southbridge.c b/drivers/mfd/rdc321x-southbridge.c
index 193c940..10dbe63 100644
--- a/drivers/mfd/rdc321x-southbridge.c
+++ b/drivers/mfd/rdc321x-southbridge.c
@@ -97,6 +97,7 @@
 	{ PCI_DEVICE(PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030) },
 	{}
 };
+MODULE_DEVICE_TABLE(pci, rdc321x_sb_table);
 
 static struct pci_driver rdc321x_sb_driver = {
 	.name		= "RDC321x Southbridge",