ARM: dts: ux500: Add die temperature to AB8505

The AB8505 mixed signal ASIC variant has a die temperature
channel that is missing in the AB8500 variant. Add it to
the DTSI.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-ab8505.dtsi

@@ -13,7 +13,8 @@ iio-hwmon {
 			      <&gpadc 0x08>, /* Main battery voltage */
 			      <&gpadc 0x09>, /* VBUS */
 			      <&gpadc 0x0b>, /* Charger current */
-			      <&gpadc 0x0c>; /* Backup battery voltage */
+			      <&gpadc 0x0c>, /* Backup battery voltage */
+			      <&gpadc 0x0d>; /* Die temperature */
 	};
 
 	soc {
@@ -83,6 +84,9 @@ charger_c: channel@0b {
 					bk_bat_v: channel@0c {
 						reg = <0x0c>;
 					};
+					die_temp: channel@0d {
+						reg = <0x0d>;
+					};
 					usb_id: channel@0e {
 						reg = <0x0e>;
 					};