codal_app: Update codal-microbit-v2 to v0.2.43.

[microbit-carlos]

Also adds the MICROBIT_USB_SERIAL_WAKE flag to the CODAL config to enable wake up from UART.

Changes to codal-microbit-v2:

• deepSleep() with no wake targets will now actually deep sleep.
• Serial ports can now be used to wake the board from deep sleep.
• New configuration flag MICROBIT_USB_SERIAL_WAKE can now be set to configure the board to wake on serial input.

Changes to codal-core:

• Fixed spurious mic activation due to overlapping device IDs between CodalComponent and MicroBitCompat.

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@dpgeorge This is what I've been using for the latest MicroPython testing. Feel free to close the PR if you prefer to update the CODAL tag differently or with other code changes.

[microbit-carlos]

Added a new commit set LEVEL_DETECTOR_SPL_8BIT_000_POINT to 52.0 dB.

This is to match the same floor as the previous implementation, as the new version is more sensitive to lower volume levels. This has been discussed in:

• https://github.com/lancaster-university/codal-microbit-v2/issues/236

This change can be removed with the next CODAL tag 0.2.44, which will change the default value of LEVEL_DETECTOR_SPL_8BIT_000_POINT to 52. But in the meantime adding this here as a representation of the MicroPython build I've been using for testing.

[dpgeorge]

This is good, thank you! I tested deep_sleep() and it does wake on incoming UART character.