Add initial support for this device. The AGC and tracking filter
settings for the mxl5003 are known to be wrong, but it generally works.
Signed-off-by: NDaniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Signed-off-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>