[media] Mirics MSi3101 SDR Dongle driver

It is first Kernel software defined radio receiver driver.
That device is sold as a digital television solution.
MSi3101 is reference design which consists of two chips:
1) MSi2500 USB ADC
2) MSi001 RF-tuner
Driver is put to staging as API is not ready.

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