Move board_init_f_mem() into a common location

This function will be used by both SPL and U-Boot proper. So move it into
a common place. Also 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>
diff --git a/common/init/Makefile b/common/init/Makefile
new file mode 100644
index 0000000..4902635
--- /dev/null
+++ b/common/init/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2015 Google, Inc
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y += board_init.o