Bluetooth: Controller: Use OVERHEAD_XTAL_US from devicetree

Use the external crystal high frequency clock settling value
from devicetree.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h

@@ -1,10 +1,14 @@
 /*
- * Copyright (c) 2018-2019 Nordic Semiconductor ASA
+ * Copyright (c) 2018-2025 Nordic Semiconductor ASA
  *
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#if DT_NODE_HAS_PROP(DT_NODELABEL(hfxo), startup_time_us)
+#define EVENT_OVERHEAD_XTAL_US        DT_PROP(DT_NODELABEL(hfxo), startup_time_us)
+#else
 #define EVENT_OVERHEAD_XTAL_US        1500
+#endif
 #define EVENT_OVERHEAD_PREEMPT_US     0    /* if <= min, then dynamic preempt */
 #define EVENT_OVERHEAD_PREEMPT_MIN_US 0
 #define EVENT_OVERHEAD_PREEMPT_MAX_US EVENT_OVERHEAD_XTAL_US

subsys/bluetooth/controller/ll_sw/ull_conn.c

@@ -5,11 +5,14 @@
  */
 
 #include <stddef.h>
+
 #include <zephyr/kernel.h>
-#include <soc.h>
+#include <zephyr/devicetree.h>
 #include <zephyr/bluetooth/hci_types.h>
 #include <zephyr/sys/byteorder.h>
 
+#include <soc.h>
+
 #include "hal/cpu.h"
 #include "hal/ecb.h"
 #include "hal/ccm.h"

subsys/bluetooth/controller/ll_sw/ull_scan_aux.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/devicetree.h>
 #include <zephyr/sys/byteorder.h>
 #include <zephyr/sys/slist.h>
 #include <zephyr/sys/util.h>

tests/bluetooth/controller/mock_ctrl/src/ull.c

@@ -5,6 +5,7 @@
  */
 
 #include <zephyr/types.h>
+#include <zephyr/devicetree.h>
 #include <zephyr/ztest.h>
 
 #include <zephyr/bluetooth/hci.h>

tests/bluetooth/controller/mock_ctrl/src/ull_conn_iso.c

@@ -7,6 +7,7 @@
 #include <zephyr/ztest.h>
 
 #include <zephyr/kernel.h>
+#include <zephyr/devicetree.h>
 
 #include "hal/ccm.h"
 #include "hal/ticker.h"

tests/bluetooth/controller/mock_ctrl/src/ull_peripheral_iso.c

@@ -7,6 +7,7 @@
 #include <zephyr/ztest.h>
 
 #include <zephyr/kernel.h>
+#include <zephyr/devicetree.h>
 #include <zephyr/bluetooth/buf.h>
 #include <zephyr/sys/byteorder.h>