media: ca docs: document CA_SET_DESCR ioctl and structs
The av7110 driver uses CA_SET_DESCR to store the descrambler
control words at the CA descrambler slots.
Document it.
Thanks-to: Honza Petrouš <jpetrous@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
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