ARM: at91/dt: ariag25: define crystals frequencies

Define Acme Systems Aria G25 board main and slow crystals frequencies.

Signed-off-by: Alexandre Belloni <[e-mail]>
Acked-by: Nicolas Ferre <[e-mail]>

arch/arm/boot/dts/at91-ariag25.dts

···
 			compatible = "atmel,osc", "fixed-clock";
 			clock-frequency = <12000000>;
 		};
+
+		slow_xtal {
+			clock-frequency = <32768>;
+		};
+
+		main_xtal {
+			clock-frequency = <12000000>;
+		};
 	};
 
 	ahb {