mvebu: Use CONFIG_SPL_STACK + 4 directly for bootparam location

The definition of CONFIG_SPL_BOOTROM_SAVE is always a fixed
CONFIG_SPL_STACK + 4, while CONFIG_SPL_STACK is not constant.  This
change will make it clear where the location is still, once
CONFIG_SPL_STACK moves to Kconfig.

Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-mvebu/spl.c b/arch/arm/mach-mvebu/spl.c
index fa9a1d7..13c9991 100644
--- a/arch/arm/mach-mvebu/spl.c
+++ b/arch/arm/mach-mvebu/spl.c
@@ -283,7 +283,7 @@
 int board_return_to_bootrom(struct spl_image_info *spl_image,
 			    struct spl_boot_device *bootdev)
 {
-	u32 *regs = *(u32 **)CONFIG_SPL_BOOTROM_SAVE;
+	u32 *regs = *(u32 **)(CONFIG_SPL_STACK + 4);
 
 	printf("Returning to BootROM (return address 0x%08x)...\n", regs[13]);
 	return_to_bootrom();