The global data are in the .data section, so there's no point in
reserving any space for it above stack. Put stack at the end of
SRAM.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>