[media] Kconfig: sub-driver auto-select SPI bus

Mirics MSi001 and MSi2500 drivers uses SPI bus. Due to that we need
auto-select it too.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>