intc_gicv3_its: anticipate initialization priority

The intc_gicv3_its driver is currently initializing in POST_KERNEL, but
PCIe device nodes depends on it and are initialized earlier. Change the
init level to PRE_KERNEL_1 to sort that out, and also put the driver in
line with other interrupt controller drivers.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

drivers/interrupt_controller/intc_gicv3_its.c

@@ -676,7 +676,7 @@ struct its_driver_api gicv3_its_api = {
 	DEVICE_DT_INST_DEFINE(n, &gicv3_its_init, NULL,			       \
 			      &gicv3_its_data##n,			       \
 			      &gicv3_its_config##n,			       \
-			      POST_KERNEL,				       \
+			      PRE_KERNEL_1,				       \
 			      CONFIG_INTC_INIT_PRIORITY,		       \
 			      &gicv3_its_api);