arm: xea: config: Enable support for XEA board specific device tree tweaks

This patch enables support for CONFIG_OF_BOARD_SETUP in xea defconfig.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig
index 7281e86..ef83e4d 100644
--- a/configs/imx28_xea_defconfig
+++ b/configs/imx28_xea_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_SPL_TEXT_BASE=0x1000
 CONFIG_FIT=y
+CONFIG_OF_BOARD_SETUP=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL_BOARD_INIT=y
 # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set