ESP32 IDF V4 - Issue I2C Setup

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SimonGAndrews
An error occurs using espruino in the ESP32-C3 IDF 4 build. when setting up the i2C. In more detail: When building with the command line:
```
BOARD=ESP32C3_IDF4 DEBUG=1 make flash BINDIR=.
```
The error occurs when executing the espruino command:
```
I2C1.setup({scl:D9,sda:D8});
```
The error text is :

i2c: i2c_param_config(684): i2c clock choice is invalid, please check
flag and frequency

Uncaught Error: jshI2CSetup: Invalid arguments at line 1 col 27

I2C1.setup({scl:D9,sda:D8});

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