ARM: dts: at91: at91sam9g45 family: reduce the trng register map size

No need to map 0x4000 bytes for the TRNG device: reduce it to 0x100.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9g45.dtsi

@@ -978,7 +978,7 @@ macb0: ethernet@fffbc000 {
 
 			trng@fffcc000 {
 				compatible = "atmel,at91sam9g45-trng";
-				reg = <0xfffcc000 0x4000>;
+				reg = <0xfffcc000 0x100>;
 				interrupts = <6 IRQ_TYPE_LEVEL_HIGH 0>;
 				clocks = <&trng_clk>;
 			};