Remove the modem peripheral from esp32p4.

[mdwn]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo fmt command to ensure that all changed code is formatted correctly.
• I have used cargo clippy command to ensure that all changed code passes latest Clippy nightly lints.
• My changes were added to the CHANGELOG.md in the proper section.

Pull Request Details 📖

Description

The esp32p4 doesn't have a radio, so the modem peripheral has been removed for esp32p4.

Testing

Compiled against the esp32p4. trying to access modem:

    let peripherals = esp_idf_svc::hal::peripherals::Peripherals::take().unwrap();
    peripherals.modem.power_on();

error[E0609]: no field `modem` on type `Peripherals`
  --> src/main.rs:28:17
   |
28 |     peripherals.modem.power_on();
   |                 ^^^^^ unknown field
   |
   = note: available fields are: `pins`, `uart0`, `uart1`, `i2c0`, `i2c1` ... and 12 others

For more information about this error, try `rustc --explain E0609`.
error: could not compile `osc-pedal` (bin "osc-pedal") due to 1 previous error

[ivmarkov]

Thanks!