Bluetooth: GMAP: Add requirement for Broadcast assitant for BGS

As per GMAP 1.0.1, the BGS role now requires support for the
BAP Broadcast Assistant.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

Author: Thalley

subsys/bluetooth/audio/Kconfig.gmap

@@ -12,7 +12,7 @@ config BT_GMAP_UGT_SUPPORTED
 	def_bool BT_CAP_ACCEPTOR && BT_BAP_UNICAST_SERVER
 
 config BT_GMAP_BGS_SUPPORTED
-	def_bool BT_CAP_INITIATOR && BT_BAP_BROADCAST_SOURCE
+	def_bool BT_CAP_INITIATOR && BT_BAP_BROADCAST_SOURCE && BT_BAP_BROADCAST_ASSISTANT
 
 config BT_GMAP_BGR_SUPPORTED
 	def_bool BT_CAP_ACCEPTOR && BT_BAP_BROADCAST_SINK && BT_VCP_VOL_REND