LEDC: improved support for ESP32-C3 and refactored divisor calculation

As ESP32C3 does not have support for REF_TICK source clock, it is now not
possible to select it anymore.
Auto cfg clock has been improved for all boards.

components/soc/esp32s3/include/soc/ledc_caps.h

@@ -1,15 +1,8 @@
-// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/*
+ * SPDX-FileCopyrightText: 2019-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 #pragma once
 
@@ -17,6 +10,8 @@
 extern "C" {
 #endif
 
+#define SOC_LEDC_HAS_TIMER_SPECIFIC_MUX  (1)
+#define SOC_LEDC_SUPPORT_REF_TICK    (1)
 #define SOC_LEDC_SUPPORT_XTAL_CLOCK  (1)
 #define SOC_LEDC_CHANNEL_NUM 8
 #define SOC_LEDC_TIMER_BIT_WIDE_NUM  (14)