Bluetooth: Controller: Fix missing ISO Receiver address capture

Fix missing ISO Receiver access address capture that caused
ISO PDU reception error. Missing access address capture for
subsequent subevent when prior subevent did not have an
anchor point sync prevent proper drift compensation hence
causing ISO PDU reception error for the entire BIG event.

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

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_sync_iso.c

@@ -1301,6 +1301,13 @@ static void isr_rx(void *param)
 
 	radio_switch_complete_and_disable();
 
+	/* Setup Access Address capture for subsequent subevent if there has been no anchor point
+	 * sync previously.
+	 */
+	if (radio_tmr_aa_restore() == 0U) {
+		radio_tmr_aa_capture();
+	}
+
 	/* PDU Header Complete TimeOut, calculate the absolute timeout in
 	 * microseconds by when a PDU header is to be received for each
 	 * subevent.