mx51evk: support new relocation scheme

This patch is to fix build breakage and support new relocation
scheme for mx51evk.

- Correct IRAM base address and add size definition

  The IRAM starts from 0x1FFE0000 on final revsion i.mx51 than
  0x1FFE8000 which is for older revision.

- Include imx-regs.h in mx51evk.h

  Definitions like CSD0_BASE_ADDR and IRAM_BASE_ADDR can be
  referred to.

- Define CONFIG_SYS_INIT_RAM_ADDR and CONFIG_SYS_INIT_RAM_SIZE

  They are used to define init RAM layout.

- Remove comment for CONFIG_SYS_GBL_DATA_SIZE which has been
  buried by Wolfgang's commit below

  25ddd1fb: Replace CONFIG_SYS_GBL_DATA_SIZE by auto-generated value

Signed-off-by: Shawn Guo <shawn.gsc@gmail.com>

include/configs/mx51evk.h

@@ -24,11 +24,11 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#include <asm/arch/imx-regs.h>
 
  /* High Level Configuration Options */
 
 #define CONFIG_MX51	/* in a mx51 */
-#define CONFIG_SKIP_RELOCATE_UBOOT
 
 #define CONFIG_SYS_MX5_HCLK	24000000
 #define CONFIG_SYS_MX5_CLK32		32768
@@ -51,7 +51,6 @@
  * Size of malloc() pool
  */
 #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + 2 * 1024 * 1024)
-/* size in bytes reserved for initial data */
 
 #define BOARD_LATE_INIT
 
@@ -200,6 +199,15 @@
 #define PHYS_SDRAM_1		CSD0_BASE_ADDR
 #define PHYS_SDRAM_1_SIZE	(512 * 1024 * 1024)
 
+#define CONFIG_SYS_SDRAM_BASE		(PHYS_SDRAM_1)
+#define CONFIG_SYS_INIT_RAM_ADDR	(IRAM_BASE_ADDR)
+#define CONFIG_SYS_INIT_RAM_SIZE	(IRAM_SIZE)
+
+#define CONFIG_SYS_INIT_SP_OFFSET \
+	(CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
+#define CONFIG_SYS_INIT_SP_ADDR \
+	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
+
 #define CONFIG_SYS_DDR_CLKSEL	0
 #define CONFIG_SYS_CLKTL_CBCDR	0x59E35100