media: dt-bindings: media: i2c: imx334 add new link_freq

Add new supported link frequency in dt example.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Suggested-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>