arm64: dts: qcom: apq8016-sbc: Set ov5640 assigned-clock

The driver for the ov5640 doesn't do a set-rate, instead it expects the
clock to already be set at an appropriate rate.

Similarly the yaml for ov5640 doesn't understand clock-frequency. Convert
from clock-rate to assigned-clock and assigned-clock-rate to remediate.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230811234738.2859417-5-bryan.odonoghue@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/apq8016-sbc.dts

@@ -280,7 +280,8 @@ camera_rear@3b {
 
 		clocks = <&gcc GCC_CAMSS_MCLK0_CLK>;
 		clock-names = "xclk";
-		clock-frequency = <23880000>;
+		assigned-clocks = <&gcc GCC_CAMSS_MCLK0_CLK>;
+		assigned-clock-rates = <23880000>;
 
 		DOVDD-supply = <&camera_vdddo_1v8>;
 		AVDD-supply = <&camera_vdda_2v8>;