Pull current Raspberry Pi firmware from upstream for Minotaur

[Mike Silva]

The Raspberry Pi Project releases 3 types of firmware for their devices:
Default (Factory Default)
Stable (Beta plus significant testing)
Beta

These contain firmware for the CPU, GPU, USB controller, etc.

Mantic Minotaur currently has the Raspberry Pi firmware package for all of these that dates to the Pi project's release on Jan 11, 2023. The current release from upstream at the Raspberry Pi project is dated August 11, 2023. This includes the start of some fairly large changes to their Beta firmware release packaging. (Flagging that for your consideration.) The latest release to contain changes to both Stable and Default is dated May 18, 2023.

The fix contained in the May 18, 2023 release is:
- Fix intermittent hang when initialising secure-boot during a reboot loop.

Given the nature of the Pi hardware and its firmware, it is often quite helpful for users to be able to check if a Stable or Beta fix helps them with an issue. Both to increase system stability, and also to allow them to contribute to further testing to move firmware releases along. Ubuntu uses the standard Pi project rpi-eeprom-updater to allow users to change between whichever release grade of firmware [Default, Stable, Beta] they wish. This is the way users are supposed to update firmware.

As such, it would be helpful to Ubuntu users if Ubuntu could keep the linux-firmware-raspi and rpi-eeprom packages in sync with a current pull of upstream at each major release of a new Ubuntu version (e.g. Lunar -> Minotaur)...or some more frequent schedule than the purely ad hoc way it's been to date.

Then, a user may try moving between both the Pi Project's current Default, Stable, and Beta firmware releases, or, roll back to a previous Ubuntu package release of linux-firmware-raspi to keep there systems stable.

Ubuntu is not a rolling release. But 1) I'm asking that at least major Ubuntu releases be kept in sync with upstream firmware and 2) these are proprietary blobs, so they should be kept at least as up to date as the frequency of pulls from upstream that Ubuntu does for analogous proprietary blobs in linux-firmware. Rather, than languishing at an old versions for years or months.

The following are presently installed on my system. They are the latest available as of this evening in the Minotaur beta cycle:

uname -a
Linux Vancouver 6.2.0-1009-raspi #11-Ubuntu SMP PREEMPT Mon Jul 17 10:19:57 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

lsb_release -rd
No LSB modules are available.
Description: Ubuntu Mantic Minotaur (development branch)
Release: 23.10

rpi-eeprom/mantic,now 16.0-1ubuntu1 arm64 [installed,automatic]
  Raspberry Pi 4 boot EEPROM updater

linux-firmware-raspi/mantic,now 9-0ubuntu1 arm64 [installed]
  Raspberry Pi 2/3/4 GPU firmware and bootloaders

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.