dts: same70: use lower case letter in tc0 reg address

The change removes the following warning:
Warning: /soc/tc@4000C000: simple-bus unit address format error,
         expected "4000c000"

Signed-off-by: Piotr Mienkowski <[email protected]>

Author: mnkp

dts/arm/atmel/same70.dtsi

@@ -357,7 +357,7 @@
 
 		tc0: tc@4000C000 {
 			compatible = "atmel,sam-tc";
-			reg = <0x4000C000 0x100>;
+			reg = <0x4000c000 0x100>;
 			interrupts = <23 0
 				      24 0
 				      25 0>;