config: xea: Add limits for SPL and u-boot proper sizes

The XEA board has following hard constraints regarding size of binaries:
- u-boot.sb < 48 KiB
- u-boot.img < 448 KiB

Added values are supposed to avoid exceeding size of binaries during
future u-boot development.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig
index 6098c1f..822a329 100644
--- a/configs/imx28_xea_defconfig
+++ b/configs/imx28_xea_defconfig
@@ -21,12 +21,15 @@
 CONFIG_SPL_SERIAL=y
 CONFIG_SPL_STACK=0x20000
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x1000
+CONFIG_SPL_SIZE_LIMIT=0xa000
 CONFIG_SPL=y
 CONFIG_ENV_OFFSET_REDUND=0x90000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI=y
 CONFIG_SYS_LOAD_ADDR=0x42000000
 CONFIG_SPL_PAYLOAD="u-boot.img"
+CONFIG_HAS_BOARD_SIZE_LIMIT=y
+CONFIG_BOARD_SIZE_LIMIT=458752
 CONFIG_TIMESTAMP=y
 CONFIG_FIT=y
 # CONFIG_BOOTMETH_EXTLINUX is not set