ARM: dts: sama5d3: fix gadget endpoint address warning

arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@10: graph node unit address error, expected "a"
arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@11: graph node unit address error, expected "b"
arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@12: graph node unit address error, expected "c"
arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@13: graph node unit address error, expected "d"
arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@14: graph node unit address error, expected "e"
arch/arm/dts/sama5d36ek.dtb: Warning (graph_endpoint): /ahb/gadget@00500000/endpoint@15: graph node unit address error, expected "f"

Fixed by changing address in node name to hex.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/arch/arm/dts/sama5d3.dtsi b/arch/arm/dts/sama5d3.dtsi
index 7db66c5..6ed218e 100644
--- a/arch/arm/dts/sama5d3.dtsi
+++ b/arch/arm/dts/sama5d3.dtsi
@@ -1447,37 +1447,37 @@
 				atmel,nb-banks = <2>;
 			};
 
-			ep10: endpoint@10 {
+			ep10: endpoint@a {
 				reg = <10>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;
 			};
 
-			ep11: endpoint@11 {
+			ep11: endpoint@b {
 				reg = <11>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;
 			};
 
-			ep12: endpoint@12 {
+			ep12: endpoint@c {
 				reg = <12>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;
 			};
 
-			ep13: endpoint@13 {
+			ep13: endpoint@d {
 				reg = <13>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;
 			};
 
-			ep14: endpoint@14 {
+			ep14: endpoint@e {
 				reg = <14>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;
 			};
 
-			ep15: endpoint@15 {
+			ep15: endpoint@f {
 				reg = <15>;
 				atmel,fifo-size = <1024>;
 				atmel,nb-banks = <2>;