[media] doc-rst: Document ioctl LIRC_GET_FEATURES
The documentation for this ioctl was really crappy.
Add a better documentation, using the lirc.4 man pages as a
reference, plus what was written originally at the lirc-ioctl.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
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