Support Wi-Fi during light sleep

[bugadani]

REGDMA-less variant, so it doesn't achieve the absolute minimum power consumption, but we have to start somewhere before implementing that machinery in a way that it can be part of esp-hal's public API.

Current draw was only tested on the jumpered devkits, C2, C3, S2 and S3 are only functionally tested for now.

Changelog

esp-hal

• Added: Drivers in other crates can claim a wakeup source with WakeupSource::enable_with_hooks. The entry hook can refuse a light sleep or keep a clock source running (WrappedSleepConfig).
• Changed: LowPower::sleep_light returns LightSleep. LightSleep::Refused tells that a wakeup source refused the sleep.
• Changed: ESP32-C6: Light sleep powers down the BBPLL. This decreases the sleep current by approximately 2 mA.
• Fixed: ESP32-C3/S3: A light sleep that keeps the main crystal on now keeps the bias current and the voltage of the crystal.

esp-rtos

• Changed: When a wakeup source refuses an automatic light sleep, the idle hook waits for an interrupt.

esp-radio

• Added: The chip can go into automatic light sleep while the Wi-Fi station uses a power save mode. ESP32 is not supported.
• Changed: Wi-Fi does not hold a wake lock anymore, except on the ESP32.

[bjoernQ]

Looks good but breaks the ble-advertise-after-sleep reproducer on C6 for me

[bugadani]

That's because the workaround was moved to fa22e21, in #6378. This happened because the PRs' order got swapped.

[bjoernQ]

LGTM - we need to double check ble-advertise-after-sleep esp32c6/C6 after #6378