kconfig: refactor xtal freq kconfig to common configuration item

components/soc/esp32s2/include/soc/Kconfig.soc_caps.in

@@ -143,6 +143,10 @@ config SOC_TOUCH_SENSOR_SUPPORTED
     bool
     default y
 
+config SOC_XTAL_SUPPORT_40M
+    bool
+    default y
+
 config SOC_ADC_RTC_CTRL_SUPPORTED
     bool
     default y

components/soc/esp32s2/include/soc/rtc.h

@@ -170,7 +170,7 @@ typedef struct {
  * Default initializer for rtc_clk_config_t
  */
 #define RTC_CLK_CONFIG_DEFAULT() { \
-    .xtal_freq = RTC_XTAL_FREQ_40M, \
+    .xtal_freq = CONFIG_XTAL_FREQ, \
     .cpu_freq_mhz = 80, \
     .fast_clk_src = SOC_RTC_FAST_CLK_SRC_RC_FAST, \
     .slow_clk_src = SOC_RTC_SLOW_CLK_SRC_RC_SLOW, \

components/soc/esp32s2/include/soc/soc_caps.h

@@ -75,6 +75,8 @@
 #define SOC_MEMPROT_SUPPORTED           1
 #define SOC_TOUCH_SENSOR_SUPPORTED      1
 
+/*-------------------------- XTAL CAPS ---------------------------------------*/
+#define SOC_XTAL_SUPPORT_40M            1
 
 /*-------------------------- ADC CAPS ----------------------------------------*/
 /*!< SAR ADC Module*/