ARM: at91: sama5d3: Add SFR

The sama5d3 has Special Function Registers that allow to manage OHCI, EBI and
the UTMI clock.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[nicolas.ferre@atmel.com: reg size: 0x60]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/sama5d3.dtsi

@@ -217,6 +217,11 @@ isi: isi@f0034000 {
 				status = "disabled";
 			};
 
+			sfr: sfr@f0038000 {
+				compatible = "atmel,sama5d3-sfr", "syscon";
+				reg = <0xf0038000 0x60>;
+			};
+
 			mmc1: mmc@f8000000 {
 				compatible = "atmel,hsmci";
 				reg = <0xf8000000 0x600>;