board_init_f_mem(): Don't create an unused early malloc() area

Change the #ifdef so that the early malloc() area is not set up in SPL if
CONFIG_SYS_SPL_MALLOC_START is defined. In that case it would never actually
be used, and just chews up stack space.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Masahiro Yamada <yamada.masahiro@socionext.com>

common/init/board_init.c

@@ -50,7 +50,8 @@ ulong board_init_f_mem(ulong top)
 #endif
 	arch_setup_gd(gd_ptr);
 
-#if defined(CONFIG_SYS_MALLOC_F)
+#if defined(CONFIG_SYS_MALLOC_F) && \
+	(!defined(CONFIG_SPL_BUILD) || !defined(CONFIG_SYS_SPL_MALLOC_START))
 	top -= CONFIG_SYS_MALLOC_F_LEN;
 	gd->malloc_base = top;
 #endif