arm: dts: at91: sama5: Add flexcom4 node

Set up flexcom4 for Microchip SAMA5D27 SoC and prepare it for usage in
I2C mode.

Signed-off-by: Artur Rojek <artur@conclusive.pl>
diff --git a/arch/arm/dts/sama5d2.dtsi b/arch/arm/dts/sama5d2.dtsi
index dd6468e..819564f 100644
--- a/arch/arm/dts/sama5d2.dtsi
+++ b/arch/arm/dts/sama5d2.dtsi
@@ -781,6 +781,26 @@
 				status = "disabled";
 			};
 
+			flx4: flexcom@fc018000 {
+				compatible = "atmel,sama5d2-flexcom";
+				reg = <0xfc018000 0x200>;
+				clocks = <&flx4_clk>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0x0 0xfc018000 0x800>;
+				status = "disabled";
+
+				i2c6: i2c@600 {
+					compatible = "atmel,sama5d2-i2c";
+					reg = <0x600 0x200>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+					clocks = <&flx4_clk>;
+					clock-names = "i2c6_clk";
+					status = "disabled";
+				};
+			};
+
 			aic: interrupt-controller@fc020000 {
 				#interrupt-cells = <3>;
 				compatible = "atmel,sama5d2-aic";