configs: colibri_vf: limit size of malloc() pool before relocation

Limit the size of the malloc() pool before relocation
(SYS_MALLOC_F_LEN).

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/configs/colibri_vf_defconfig b/configs/colibri_vf_defconfig
index 4192501..8188582 100644
--- a/configs/colibri_vf_defconfig
+++ b/configs/colibri_vf_defconfig
@@ -2,6 +2,7 @@
 CONFIG_SYS_THUMB_BUILD=y
 CONFIG_ARCH_VF610=y
 CONFIG_SYS_TEXT_BASE=0x3f401000
+CONFIG_SYS_MALLOC_F_LEN=0x800
 CONFIG_TARGET_COLIBRI_VF=y
 CONFIG_ENV_VARS_UBOOT_CONFIG=y
 CONFIG_NR_DRAM_BANKS=1