dt-bindings: media: nxp,imx-mipi-csi2: Mark clock-frequency as deprecated

Usage of the clock-frequency property, which is already optional, is
discouraged in favour of using assigned-clock-rates (and
assigned-clock-parents where needed). Mark the property as deprecated,
and update the examples accordingly.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Laurent Pinchart <[e-mail]>
Reviewed-by: Frank Li <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

Documentation/devicetree/bindings/media/nxp,imx-mipi-csi2.yaml

···
   clock-frequency:
     description: The desired external clock ("wrap") frequency, in Hz
     default: 166000000
+    deprecated: true
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
···
                  <&clks IMX7D_MIPI_CSI_ROOT_CLK>,
                  <&clks IMX7D_MIPI_DPHY_ROOT_CLK>;
         clock-names = "pclk", "wrap", "phy";
-        clock-frequency = <166000000>;
+
+        assigned-clocks = <&clks IMX7D_MIPI_CSI_ROOT_CLK>;
+        assigned-clock-rates = <166000000>;
 
         power-domains = <&pgc_mipi_phy>;
         phy-supply = <&reg_1p0d>;
···
         compatible = "fsl,imx8mm-mipi-csi2";
         reg = <0x32e30000 0x1000>;
         interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
-        clock-frequency = <333000000>;
+
         clocks = <&clk IMX8MM_CLK_DISP_APB_ROOT>,
                  <&clk IMX8MM_CLK_CSI1_ROOT>,
                  <&clk IMX8MM_CLK_CSI1_PHY_REF>,
                  <&clk IMX8MM_CLK_DISP_AXI_ROOT>;
         clock-names = "pclk", "wrap", "phy", "axi";
+
+        assigned-clocks = <&clk IMX8MM_CLK_CSI1_ROOT>;
+        assigned-clock-rates = <250000000>;
+
         power-domains = <&mipi_pd>;
 
         ports {