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.
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.
update all struct headers to be more "standardized":
- bit fields are properly wrapped with struct
- bitwidth sum should be 32 within same struct, so that it's correctly padded with reserved bits
- bit field should be uint32_t
- typedef volatile struct xxx{} yyy;: xxx must exists. refer: https://github.com/espressif/esp-idf/pull/3199
added helper macros to force peripheral registers being accessed in 32 bitwidth
added a check script into ci
