media: ARM: dts: imx6qdl-wandboard: Drop clock-names property

Now that the driver has been updated to drop fetching the clk reference by
name we no longer need the clock-names property in the ov5645 sensor node.

This is in preparation for removal for clock-names property from the DT
binding.

Signed-off-by: Lad Prabhakar <[e-mail]>
Acked-by: Shawn Guo <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

arch/arm/boot/dts/imx6qdl-wandboard.dtsi

···
 		pinctrl-0 = <&pinctrl_ov5645>;
 		reg = <0x3c>;
 		clocks = <&clks IMX6QDL_CLK_CKO2>;
-		clock-names = "xclk";
 		clock-frequency = <24000000>;
 		vdddo-supply = <&reg_1p8v>;
 		vdda-supply = <&reg_2p8v>;