arm64: zynqmp: Setting default i2c clock frequency to 400kHz

Setting default i2c clock frequency for ZynqMP to maximum rate of 400kHz.
Current default value is 100kHz.
Signed-off-by: Varalaxmi Bingi <varalaxmi.bingi@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/3034ec006c8b11e025904d4cc2524255523636f6.1686227766.git.michal.simek@amd.com

arch/arm64/boot/dts/xilinx/zynqmp.dtsi

@@ -648,6 +648,7 @@ i2c0: i2c@ff020000 {
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 17 4>;
+			clock-frequency = <400000>;
 			reg = <0x0 0xff020000 0x0 0x1000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
@@ -659,6 +660,7 @@ i2c1: i2c@ff030000 {
 			status = "disabled";
 			interrupt-parent = <&gic>;
 			interrupts = <0 18 4>;
+			clock-frequency = <400000>;
 			reg = <0x0 0xff030000 0x0 0x1000>;
 			#address-cells = <1>;
 			#size-cells = <0>;