arm64: dts: qcom: ipq6018: drop the clock-frequency property

clock-frequency for IPQ6018 SoCs should be 24MHz, not 19.2MHz. Rather
than correcting it, drop the property itself since its already
configured by the bootloader.
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1643819709-5410-3-git-send-email-quic_kathirav@quicinc.com

arch/arm64/boot/dts/qcom/ipq6018.dtsi

@@ -530,7 +530,6 @@ timer@b120000 {
 			ranges;
 			compatible = "arm,armv7-timer-mem";
 			reg = <0x0 0x0b120000 0x0 0x1000>;
-			clock-frequency = <19200000>;
 
 			frame@b120000 {
 				frame-number = <0>;