arm: mvebu: turris_omnia: disable MCU watchdog in SPL when booting over UART

When booting over UART, sending U-Boot proper may take too much time and
MCU watchdog will reset the board before U-Boot proper is loaded.

Better disable MCU watchdog in SPL when booting over UART.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/turris_omnia_defconfig b/configs/turris_omnia_defconfig
index 2acc4ad..b2bbbd1 100644
--- a/configs/turris_omnia_defconfig
+++ b/configs/turris_omnia_defconfig
@@ -33,6 +33,7 @@
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_MISC_INIT_R=y
+CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_I2C=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_ALT_MEMTEST=y