[nrf noup] Bluetooth: controller: Change LL version to 5.1

Change the LL version back to 5.1, to be able to re-use existing
Bluetooth conformance qualification.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>

Author: joerchan

subsys/bluetooth/controller/include/ll.h

@@ -5,7 +5,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#define LL_VERSION_NUMBER BT_HCI_VERSION_5_2
+#define LL_VERSION_NUMBER BT_HCI_VERSION_5_1
 
 int ll_init(struct k_sem *sem_rx);
 void ll_reset(void);