arm: mvebu: clearfog: enable watchdog in spl dtb

Add "bootph-pre-ram" flag to u-boot dts so that watchdog can already be
started from SPL.

Signed-off-by: Josua Mayer <josua@solid-run.com>

Author: Josua-SR

arch/arm/dts/armada-388-clearfog-u-boot.dtsi

@@ -1,5 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0+
 
+&watchdog {
+	bootph-pre-ram;
+};
+
 &spi1 {
 	bootph-pre-ram;