ARM: at91/trivial: fix model name for SAM9G15-EK

Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org> # 3.8+

arch/arm/boot/dts/at91sam9g15ek.dts

@@ -11,6 +11,6 @@
 /include/ "at91sam9x5ek.dtsi"
 
 / {
-	model = "Atmel AT91SAM9G25-EK";
+	model = "Atmel AT91SAM9G15-EK";
 	compatible = "atmel,at91sam9g15ek", "atmel,at91sam9x5ek", "atmel,at91sam9x5", "atmel,at91sam9";
 };