AVR32: Relocate u-boot to SDRAM

Relocate the u-boot image into SDRAM like everyone else does. This
means that we can handle much larger .data and .bss than we used to.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
diff --git a/board/atmel/atstk1000/flash.c b/board/atmel/atstk1000/flash.c
index 3aebf66..958f4dc 100644
--- a/board/atmel/atstk1000/flash.c
+++ b/board/atmel/atstk1000/flash.c
@@ -57,7 +57,7 @@
 
 	gd->bd->bi_flashstart = CFG_FLASH_BASE;
 	gd->bd->bi_flashsize = CFG_FLASH_SIZE;
-	gd->bd->bi_flashoffset = __edata_lma - _text;
+	gd->bd->bi_flashoffset = _edata - _text;
 
 	flash_info[0].size = CFG_FLASH_SIZE;
 	flash_info[0].sector_count = 135;