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/include/asm-avr32/global_data.h b/include/asm-avr32/global_data.h
index 3b6769b..7c45b36 100644
--- a/include/asm-avr32/global_data.h
+++ b/include/asm-avr32/global_data.h
@@ -37,6 +37,7 @@
 	unsigned long	flags;
 	unsigned long	baudrate;
 	unsigned long	sdram_size;
+	unsigned long	stack_end;	/* highest stack address */
 	unsigned long	have_console;	/* serial_init() was called */
 	unsigned long	reloc_off;	/* Relocation Offset */
 	unsigned long	env_addr;	/* Address of env struct */