Makes F_CPU generic for all SoC (#8007)

Based on CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ that is correctly defined in the sdkconfig file for each SoC.

Author: SuGlider

cores/esp32/esp32-hal.h

@@ -42,11 +42,7 @@ extern "C" {
 #endif
 
 #ifndef F_CPU
-#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
-#define F_CPU (CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ * 1000000U)
-#elif CONFIG_IDF_TARGET_ESP32S2
-#define F_CPU (CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ * 1000000U)
-#endif
+#define F_CPU (CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ * 1000000U)
 #endif
 
 #if CONFIG_ARDUINO_ISR_IRAM