ATSTK1002: Use SDRAM + 4MB as default load address

Many people run into problems when they compile a big kernel and load
the uImage at the default SDRAM + 2MB address as the kernel will
overwrite the uImage as it is being unpacked. Increase the default
load address so that we can load a 4MB kernel image without any
problems.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

include/configs/atstk1002.h

@@ -184,8 +184,8 @@
 #define CFG_MALLOC_LEN			(256*1024)
 #define CFG_DMA_ALLOC_LEN		(16384)
 
-/* Allow 2MB for the kernel run-time image */
-#define CFG_LOAD_ADDR			(CFG_SDRAM_BASE + 0x00200000)
+/* Allow 4MB for the kernel run-time image */
+#define CFG_LOAD_ADDR			(CFG_SDRAM_BASE + 0x00400000)
 #define CFG_BOOTPARAMS_LEN		(16 * 1024)
 
 /* Other configuration settings that shouldn't have to change all that often */