board: lsxl: limit size to 384kiB

The board only has a 4Mbit flash and two sectors are reserved for the
u-boot environment and the device tree.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/lschlv2_defconfig b/configs/lschlv2_defconfig
index 0da0583..cabedeb 100644
--- a/configs/lschlv2_defconfig
+++ b/configs/lschlv2_defconfig
@@ -18,6 +18,8 @@
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xc8012000
 CONFIG_API=y
+CONFIG_HAS_BOARD_SIZE_LIMIT=y
+CONFIG_BOARD_SIZE_LIMIT=393216
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y