x86: Reorder x86's post relocation memory layout

This changes the layout in decreasing addresses from:

1. Stack
2. Sections in the image
3. Heap

to

1. Sections in the image
2. Heap
3. Stack

This allows the stack to grow significantly more since it isn't constrained by
the other u-boot areas. More importantly, the generic memory wipe code assumes
that the stack is the lowest addressed area used by the main part of u-boot.
In the original layout, that means that u-boot tramples all over itself. In
the new layout, it works.

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/lib/init_helpers.c

@@ -86,15 +86,16 @@ int calculate_relocation_address(void)
 
 	/* Stack is at top of available memory */
 	dest_addr = gd->ram_size;
-	gd->start_addr_sp = dest_addr;
 
-	/* U-Boot is below the stack */
-	dest_addr -= CONFIG_SYS_STACK_SIZE;
+	/* U-Boot is at the top */
 	dest_addr -= (bss_end - text_start);
 	dest_addr &= ~15;
 	gd->relocaddr = dest_addr;
 	gd->reloc_off = (dest_addr - text_start);
 
+	/* Stack is at the bottom, so it can grow down */
+	gd->start_addr_sp = dest_addr - CONFIG_SYS_MALLOC_LEN;
+
 	return 0;
 }