imx8mn-var-som: read and print SoM infos from eeprom on startup

Enable support to read and display configuration/manufacturing infos
from 4Kbit EEPROM located on SOM board.

Note: CONFIG_DISPLAY_BOARDINFO is automatically selected for ARM arch.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
diff --git a/configs/imx8mn_var_som_defconfig b/configs/imx8mn_var_som_defconfig
index 350c022..9de7c91 100644
--- a/configs/imx8mn_var_som_defconfig
+++ b/configs/imx8mn_var_som_defconfig
@@ -29,6 +29,7 @@
 CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_DEFAULT_FDT_FILE="freescale/imx8mn-var-som-symphony.dtb"
+CONFIG_BOARD_TYPES=y
 CONFIG_ARCH_MISC_INIT=y
 CONFIG_SPL_MAX_SIZE=0x25000
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y