clk_tree: Add a general API to get the frequency of different clocks

Add basic clk_tree driver and hal implementation.

components/soc/esp32c2/include/soc/Kconfig.soc_caps.in

@@ -615,6 +615,10 @@ config SOC_CLK_RC_FAST_SUPPORT_CALIBRATION
     bool
     default y
 
+config SOC_CLK_OSC_SLOW_SUPPORTED
+    bool
+    default y
+
 config SOC_WIFI_HW_TSF
     bool
     default y

components/soc/esp32c2/include/soc/clk_tree_defs.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -110,6 +110,7 @@ typedef enum {
     SOC_MOD_CLK_RC_FAST,                       /*!< RC_FAST_CLK comes from the internal 20MHz rc oscillator, passing a clock gating to the peripherals */
     SOC_MOD_CLK_RC_FAST_D256,                  /*!< RC_FAST_D256_CLK comes from the internal 20MHz rc oscillator, divided by 256, and passing a clock gating to the peripherals */
     SOC_MOD_CLK_XTAL,                          /*!< XTAL_CLK comes from the external 26/40MHz crystal */
+    SOC_MOD_CLK_INVALID,                       /*!< Indication of the end of the available module clock sources */
 } soc_module_clk_t;
 
 //////////////////////////////////////////////////SYSTIMER///////////////////////////////////////////////////////////////

components/soc/esp32c2/include/soc/soc_caps.h

@@ -294,6 +294,8 @@
 #define SOC_RTC_SLOW_CLK_SUPPORT_RC_FAST_D256     (1)
 #define SOC_CLK_RC_FAST_SUPPORT_CALIBRATION       (1)
 
+#define SOC_CLK_OSC_SLOW_SUPPORTED                (1)     /*!< ESP32C2 only supports to connect an external oscillator, not a crystal */
+
 /*------------------------------------ WI-FI CAPS ------------------------------------*/
 #define SOC_WIFI_HW_TSF                 (1)    /*!< Support hardware TSF */
 #define SOC_WIFI_FTM_SUPPORT            (0)    /*!< FTM is not supported */