spl: make SPL and normal u-boot stage use independent SYS_MALLOC_F_LEN

Some platforms have very limited SRAM to run SPL code, so there may
not be the same amount space for a malloc pool before relocation in
the SPL stage as the normal U-Boot stage.

Make SPL and (the full) U-Boot stage use independent SYS_MALLOC_F_LEN,
so the size of pre-relocation malloc pool can be configured memory
space independently.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[fixed up commit-message:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/common/init/board_init.c b/common/init/board_init.c
index bf4255b..4a391be 100644
--- a/common/init/board_init.c
+++ b/common/init/board_init.c
@@ -46,8 +46,8 @@
 ulong board_init_f_alloc_reserve(ulong top)
 {
 	/* Reserve early malloc arena */
-#if defined(CONFIG_SYS_MALLOC_F)
-	top -= CONFIG_SYS_MALLOC_F_LEN;
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+	top -= CONFIG_VAL(SYS_MALLOC_F_LEN);
 #endif
 	/* LAST : reserve GD (rounded up to a multiple of 16 bytes) */
 	top = rounddown(top-sizeof(struct global_data), 16);
@@ -121,11 +121,11 @@
 	 * Use gd as it is now properly set for all architectures.
 	 */
 
-#if defined(CONFIG_SYS_MALLOC_F)
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
 	/* go down one 'early malloc arena' */
 	gd->malloc_base = base;
 	/* next alloc will be higher by one 'early malloc arena' size */
-	base += CONFIG_SYS_MALLOC_F_LEN;
+	base += CONFIG_VAL(SYS_MALLOC_F_LEN);
 #endif
 }