ipq40xx: increase EX6150v2 SPI frequency

The chip supports clock speeds up to 50 MHz, however it won't even read
the chip-id correctly at this frequency.

45 MHz however works reliable.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ipq40xx/files/arch/arm/boot/dts/qcom-ipq4018-ex61x0v2.dtsi

@@ -201,7 +201,7 @@
 	mx25l12805d@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
-		spi-max-frequency = <24000000>;
+		spi-max-frequency = <45000000>;
 
 		partitions {
 			compatible = "fixed-partitions";