omap3: Consolidate SDRC related operations

Consolidated SDRC related functions into one file - sdrc.c

And also replaced sdrc_init with generic memory init
function (mem_init), this generalization of omap memory setup
is necessary to support the new emif4 interface introduced in AM3517.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/include/configs/omap3_zoom2.h b/include/configs/omap3_zoom2.h
index c88c732..be9daf4 100644
--- a/include/configs/omap3_zoom2.h
+++ b/include/configs/omap3_zoom2.h
@@ -39,6 +39,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_ZOOM2	1	/* working with Zoom II */
 
+#define CONFIG_SDRC	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>	/* get chip and board defs */
 #include <asm/arch/omap3.h>