configs: synquacer: increase SYS_MALLOC_F_LEN

DM_FLAG_PRE_RELOC flag is added into some drivers
by recent commits such as
1bd790bc4b ("firmware: psci: enable DM_FLAG_PRE_RELOC").
Current SYS_MALLOC_F_LEN of SynQuacer Developerbox platform
is too small, Developerbox will not boot due to lack of
heap memory.

This commit increases the size of heap memory.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jassi Brar <jaswinder.singh@linaro.org>
diff --git a/configs/synquacer_developerbox_defconfig b/configs/synquacer_developerbox_defconfig
index 8e7236b..17d70ef 100644
--- a/configs/synquacer_developerbox_defconfig
+++ b/configs/synquacer_developerbox_defconfig
@@ -2,7 +2,7 @@
 CONFIG_ARCH_SYNQUACER=y
 CONFIG_POSITION_INDEPENDENT=y
 CONFIG_SYS_MALLOC_LEN=0x1000000
-CONFIG_SYS_MALLOC_F_LEN=0x400
+CONFIG_SYS_MALLOC_F_LEN=0x4000
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xe0000000
 CONFIG_SF_DEFAULT_SPEED=31250000