[media] cec: add HDMI CEC framework (core)

The added HDMI CEC framework provides a generic kernel interface for
HDMI CEC devices.

Note that the CEC framework is added to staging/media and that the
cec.h and cec-funcs.h headers are not exported yet. While the kABI
is mature, I would prefer to allow the uABI some more time before
it is mainlined in case it needs more tweaks.

This adds the cec-core.c, media/cec.h and cec-priv.h sources.

Signed-off-by: Hans Verkuil <[email protected]>
[[email protected]: Merged CEC Updates commit by Hans Verkuil]
[[email protected]: Merged Update author commit by Hans Verkuil]
[[email protected]: code cleanup and fixes]
[[email protected]: add missing CEC commands to match spec]
[[email protected]: add RC framework support]
[[email protected]: move and edit documentation]
[[email protected]: add vendor id reporting]
[[email protected]: reorder of API structs and add reserved fields]
[[email protected]: fix handling of events and fix 32/64bit timespec problem]
[[email protected]: add sequence number handling]
[[email protected]: add passthrough mode]
[[email protected]: fix CEC defines, add missing CEC 2.0 commands]
Signed-off-by: Kamil Debski <[email protected]>

Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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