ARM: dts: dra7xx: Update spi-max-frequency for qspi slave node

Update the spi-max-frequency property of m25p80 flash slave to match
that of TI QSPI controller node, so that QSPI operations happen at
maximum supported frequency of 76.8MHz.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Reviewed-by: NJagan Teki <jteki@openedev.com>

arch/arm/dts/dra7-evm.dts

@@ -505,7 +505,7 @@
 	spi-max-frequency = <76800000>;
 	m25p80@0 {
 		compatible = "s25fl256s1","spi-flash";
-		spi-max-frequency = <64000000>;
+		spi-max-frequency = <76800000>;
 		reg = <0>;
 		spi-tx-bus-width = <1>;
 		spi-rx-bus-width = <4>;

arch/arm/dts/dra72-evm-common.dtsi

@@ -441,7 +441,7 @@
 	spi-max-frequency = <76800000>;
 	m25p80@0 {
 		compatible = "s25fl256s1", "spi-flash";
-		spi-max-frequency = <64000000>;
+		spi-max-frequency = <76800000>;
 		reg = <0>;
 		spi-tx-bus-width = <1>;
 		spi-rx-bus-width = <4>;