The caches are disabled when reading/writing/erasing flash.
All CPUs should always execute code and access data from internal RAM.
Add an IRAM option to enhance the performance of LEDC.
Closes https://github.com/espressif/esp-idf/issues/11554
1. Regression introduced when refactoring on clock sources selection (0d07f859).
If channel configuration is called before timer configuration on C6, PWM signal may not be able to output.
2. Missing the improper fade parameter fix inside ledc_set_duty_and_update() function.
