[media] siano: fix Kconfig dependencies

[media] siano: fix Kconfig dependencies

The USB and MMC front-ends to the siano driver both only make
sense when combined with the SMS_SIANO_MDTV driver. That driver
already requires RC_CORE to not be a module, so we also need
to add that dependency here.

drivers/built-in.o: In function `smssdio_remove':
:(.text+0x155bd8): undefined reference to `smscore_putbuffer'
:(.text+0x155bdc): undefined reference to `smscore_unregister_device'
drivers/built-in.o: In function `smssdio_interrupt':
:(.text+0x155e4c): undefined reference to `smsendian_handle_rx_message'
:(.text+0x155e50): undefined reference to `smscore_onresponse'
:(.text+0x155e54): undefined reference to `smscore_getbuffer'
:(.text+0x155e58): undefined reference to `smscore_putbuffer'
drivers/built-in.o: In function `smssdio_sendrequest':
:(.text+0x155f20): undefined reference to `smsendian_handle_tx_message'
drivers/built-in.o: In function `smssdio_probe':
:(.text+0x15610c): undefined reference to `sms_get_board'
:(.text+0x156114): undefined reference to `smscore_register_device'
:(.text+0x156118): undefined reference to `smscore_set_board_id'
:(.text+0x156128): undefined reference to `smscore_unregister_device'
:(.text+0x156140): undefined reference to `smscore_start_device'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>