zipitz2: fix boot issue introduced by PXA low level init rework

CONFIG_SYS_INIT_SP_ADDR points to RAM, but it's used before
DRAM controller init. Fix it by setting CONFIG_SYS_INIT_SP_ADDR
to SRAM

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

include/configs/zipitz2.h

@@ -161,6 +161,12 @@ unsigned char zipitz2_spi_read(void);
 #define	CONFIG_STACKSIZE_FIQ		(4*1024)	/* FIQ stack */
 #endif
 
+/*
+ * SRAM Map
+ */
+#define	PHYS_SRAM			0x5c000000	/* SRAM Bank #1 */
+#define	PHYS_SRAM_SIZE			0x00040000	/* 256k */
+
 /*
  * DRAM Map
  */
@@ -177,7 +183,7 @@ unsigned char zipitz2_spi_read(void);
 #define	CONFIG_SYS_LOAD_ADDR		CONFIG_SYS_DRAM_BASE
 
 #define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM_1
-#define	CONFIG_SYS_INIT_SP_ADDR		(GENERATED_GBL_DATA_SIZE + PHYS_SDRAM_1 + 2048)
+#define	CONFIG_SYS_INIT_SP_ADDR		(GENERATED_GBL_DATA_SIZE + PHYS_SRAM + 2048)
 
 /*
  * NOR FLASH