ARM: at91: declare the at91rm9200 memory controller as a syscon

The at91rm9200 memory controller is not simply an SDRAM controller. It also
controls the EBI (External Bus Interface), the SMC (Static Memory Controller)and
the Burst Flash Controller.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/at91rm9200.dtsi b/arch/arm/boot/dts/at91rm9200.dtsi
index 4fb333b..6d0fa9b 100644
--- a/arch/arm/boot/dts/at91rm9200.dtsi
+++ b/arch/arm/boot/dts/at91rm9200.dtsi
@@ -92,7 +92,7 @@
 			};
 
 			ramc0: ramc@ffffff00 {
-				compatible = "atmel,at91rm9200-sdramc";
+				compatible = "atmel,at91rm9200-sdramc", "syscon";
 				reg = <0xffffff00 0x100>;
 			};