spl: Allow settings malloc_f base address

Allow configuring the begining of the malloc_f area in SPL.
This patch uses the same CONFIG_MALLOC_F_ADDR established by
the sandbox.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index bdde716..780c081 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -192,6 +192,9 @@
 
 	debug("spl_init()\n");
 #if defined(CONFIG_SYS_MALLOC_F_LEN)
+#ifdef CONFIG_MALLOC_F_ADDR
+	gd->malloc_base = CONFIG_MALLOC_F_ADDR;
+#endif
 	gd->malloc_limit = CONFIG_SYS_MALLOC_F_LEN;
 	gd->malloc_ptr = 0;
 #endif