ARM: dts: qcom: ipq8064: drop spi-max-frequency from controller

spi-max-frequency is a property of SPI device, not SPI controller.  Drop
it from the controller nodes.  No functional impact expected because
child SPI device already defines spi-max-frequency.  This fixes
dtbs_check warnings like:

  qcom-ipq8064-ap148.dtb: spi@1a280000: Unevaluated properties are not allowed ('spi-max-frequency' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230619170151.65505-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: krzk

arch/arm/boot/dts/qcom/qcom-ipq8064-rb3011.dts

@@ -282,7 +282,6 @@
 
 			spi4: spi@1a280000 {
 				status = "okay";
-				spi-max-frequency = <50000000>;
 
 				pinctrl-0 = <&spi_pins>;
 				pinctrl-names = "default";

arch/arm/boot/dts/qcom/qcom-ipq8064-v1.0.dtsi

@@ -30,7 +30,6 @@
 
 			spi4: spi@1a280000 {
 				status = "okay";
-				spi-max-frequency = <50000000>;
 
 				pinctrl-0 = <&spi_pins>;
 				pinctrl-names = "default";