Add ESP32-C2 support

[Jason2866]

Description of Change

Adding the needed code changes to support build of the ESP32-C2. Libs for the C2 are still needed.
-> Built with Arduino Lib Builder
PR espressif/esp32-arduino-lib-builder#149 for the Lib builder to support the C2

Tests scenarios

The changes have been tested in Tasmota Arduino fork and project Tasmota is successful built and running for the C2

@me-no-dev as discussed in #8864

[me-no-dev]

Thanks @Jason2866 :) I'll take over to finish support

[Jason2866]

Ah, sorry forgot about this one. I added the missing in IDF
And we don't use the "fancy" components

[me-no-dev]

@Jason2866 now it compiles as component. Will also look at the lib-builder PR

@P-R-O-C-H-Y @SuGlider @lucasssvaz PTAL

[me-no-dev]

Board Test is expected to fail due to missing SDK for C2.

[Jason2866]

@me-no-dev Thx, for the polishing and fixing.

[me-no-dev]

@Jason2866 all is good now :) both lib-builder and arduino are ready. Sketches are compiling, but we will not have it through the board manager for now. The size of the libs is 100MB. If there is enough interest or we can have them as separate package, we can include them too

[Jason2866]

@me-no-dev Big thx for the work you put in and the lightning speed!
Still curious why it is so big. Our complete framework for Arduino 3.0.0 including all MCUs and libs is around 150MB (stripped Rainmaker, SR and DSP).
The working framework for the solo1 is about 30MB https://github.com/tasmota/arduino-esp32/releases
So i expected that the C2 does add not more than 30MB.

[me-no-dev]

it adds 30MB to the ZIP and 100MB extracted. Besides that RainMaker is currently not working on it. There is close to zero interest in providing Board Manager support for it and it also takes time in the cron job that we can not afford at the time. As I said a few times, we can look into adding full support if there is enough interest or when we can make it painless to others (solo support will probably also come then)

[Jason2866]

Perfectly fine! And the size is the same the 30MB mentioned was zipped. We will see if users are asking for. I don't think Rainmaker will ever work well with the C2. The free heap is probably not enough. The C2 is not designed for heavy lifting, but it is a nice powerfull little MCU. For me it is an follow up of the ESP8266...

[me-no-dev]

I don't think Rainmaker will ever work well with the C2.

it's mentioned on the product page, so it should work. I'll report the bug

[P-R-O-C-H-Y]

Please match the SPI pins with the C3.
Tested Wifi + SD-SPI and both works well.
Thanks @Jason2866 for PR!

[lucasssvaz]

LGTM. I only recommend switching the default Serial1 pins to avoid possible conflicts.

[P-R-O-C-H-Y]

@Jason2866 Can you please change the Serial1 pins as suggested by @lucasssvaz? We will merge after that. Thanks

[Jason2866]

@P-R-O-C-H-Y Changed.