ARM: omapl138_lcdk: Increase malloc pool before relocation

Driver model requires a malloc pool to allocate memory before
relocations to operate serial and some other devices.  This patch
increases the pool size to 2K.
Signed-off-by: NAdam Ford <aford173@gmail.com>
Tested-by: NBartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: NBartosz Golaszewski <bgolaszewski@baylibre.com>

configs/omapl138_lcdk_defconfig

@@ -7,6 +7,7 @@ CONFIG_SYS_DA850_PLL1_PLLDIV3=0x8003
 CONFIG_TI_COMMON_CMD_OPTIONS=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_SYS_MALLOC_F_LEN=0x800
 CONFIG_SPL_MMC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_ENV_SIZE=0x10000