bluetooth: Enable C2H ACL data fc to avoid potential deadlocks

This commit enables C2H ACL data flow control by default to avoid
potential deadlocks. See NCSDK-30959 for details.

Known issues are updated in a separate PR.

Signed-off-by: Pavel Vasilyev <pavel.vasilyev@nordicsemi.no>

subsys/bluetooth/Kconfig

@@ -45,6 +45,13 @@ config BT_LONG_WQ_STACK_SIZE
 	default 1800 if (BT_ECC || BT_GATT_CACHING)
 	default 1024
 
+if BT_CONN
+config BT_HCI_ACL_FLOW_CONTROL
+	# Enabling this option by default for now to avoid potential deadlocks. See NCSDK-30959.
+	bool
+	default y
+endif # BT_CONN
+
 rsource "controller/Kconfig"
 rsource "host_extensions/Kconfig"