arm: socfpga: enable the Altera SDRAM controller driver

Enable the Altera SDRAM driver for the SoCFPGA platform.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/socfpga_common.h b/include/configs/socfpga_common.h
index e8473b8..66972cd 100644
--- a/include/configs/socfpga_common.h
+++ b/include/configs/socfpga_common.h
@@ -75,6 +75,11 @@
 #define CONFIG_SYS_PL310_BASE		SOCFPGA_MPUL2_ADDRESS
 
 /*
+ * SDRAM controller
+ */
+#define CONFIG_ALTERA_SDRAM
+
+/*
  * EPCS/EPCQx1 Serial Flash Controller
  */
 #ifdef CONFIG_ALTERA_SPI