ARM: dts: samsung: exynos4412-midas: Replace clock-frequency in camera sensor node

The clock-frequency for camera sensors has been deprecated in favour of
the assigned-clocks and assigned-clock-rates properties. Replace it in
the device tree.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Link: https://patch.msgid.link/20260810180604.3034255-3-laurent.pinchart@ideasonboard.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>