agnos updater: set decompress max_length

[andiradulescu]

This fixes the "MemoryError: Unable to allocate output buffer." when flashing big raw images. Write-up here.

The following changes have been implemented.

• noop flashes until no more data is returned - this way any data that remains in self.buf after eof is detected gets flashed in every case - since the loop will call read until buffer is empty
• decompress max_length is now set to length (max_length=-1 if not set) - so the output of decompress will never be more than the size of the return
• setting b'' when needs_input=false - when it has more data to decompress after the previous length
• if the last decompressed output has eof=True then we reached the end of file and the process stops

Flashing time for the sparse system image is similar (a little faster with max_length=length).

Flashing time for non-sparse raw 10GB image is ~5min.

[github-actions]

Thanks for contributing to openpilot! In order for us to review your PR as quickly as possible, check the following:

• Convert your PR to a draft unless it's ready to review
• Read the contributing docs
• Before marking as "ready for review", ensure:
  • the goal is clearly stated in the description
  • all the tests are passing
  • the change is something we merge
  • include a route or your device' dongle ID if relevant

[andiradulescu]

good cleanup and thanks for applying!