mpfs_icicle: disable watchdog (wdt4) in AMP overlay

PolarFire SoC features five watchdogs, one associated with each hart. Disable watchdog4 (associated with hart 4) in Linux when running in Asymmetric Multiprocessing (AMP) mode, since hart 4 is used to run an RTOS/BM application in another AMP context. Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com> Acked-by: Conor Dooley <conor.dooley@microchip.com>

Author: vfalanis

mpfs_icicle/mpfs_icicle_amp.dtso

@@ -71,3 +71,7 @@
 status = "disabled"; // in use by context b
 };
 
+&wdt4 {
+status = "disabled";
+};
+