[media] move V4L2 clocks to a separate .rst file

Move the v4l2 clocks stuff from v4l2-framework to a separate
file and adds an attention that came from the v4l2-clk.h.

Note: as this is meant to be a temporary kAPI, and it is
used only by two drivers (soc_camera and em28xx), where
the first one is in deprecation process, it probably not
a worth effort to document its header.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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