V4L/DVB (10801): Add headers for ST STV0900 dual demodulator.
The IC consist of two dependent parts.
It may use single or dual mode.
Signed-off-by: Igor M. Liplianin <liplianin@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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