drivers: intc_gicv3_its: fix sleep issue in pre-kernel

GIC v3 ITS is initialized in pre-kernel stage in which sleep function
can't work yet, so use busy delay in pre-kernel stage and use sleep
delay in post-kernel stage.

Signed-off-by: Jiafei Pan <[email protected]>

Author: JiafeiPan

drivers/interrupt_controller/intc_gicv3_its.c

@@ -337,7 +337,11 @@ static int its_post_command(struct gicv3_its_data *data, struct its_cmd_block *c
 				rd_idx, idx, wr_idx);
 			return -ETIMEDOUT;
 		}
-		k_usleep(1);
+		if (k_is_pre_kernel()) {
+			k_busy_wait(1);
+		} else {
+			k_usleep(1);
+		}
 	}
 
 	return 0;