[media] siano: break it into common, mmc and usb

siano is, in fact, 2 drivers: one for MMC and one for USB, plus
a common bus-independent code. Break it accordingly.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig
index aae6fec..7970c24 100644
--- a/drivers/media/Kconfig
+++ b/drivers/media/Kconfig
@@ -163,6 +163,7 @@
 source "drivers/media/dvb-core/Kconfig"
 source "drivers/media/pci/Kconfig"
 source "drivers/media/usb/Kconfig"
+source "drivers/media/mmc/Kconfig"
 
 comment "Supported FireWire (IEEE 1394) Adapters"
 	depends on DVB_CORE && FIREWIRE