[media] V4L2: add v4l2-clock helpers to register and unregister a fixed-rate clock

Many bridges and video host controllers supply fixed rate always on clocks
to their I2C devices. This patch adds two simple helpers to register and
unregister such a clock.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/v4l2-core/v4l2-clk.c
Simple merge

diff --cc include/media/v4l2-clk.h
Simple merge