Support LXA TAC Gen 2 devices (BSP)

[hnez]

Hardware generations

There is a new batch of LXA TAC devices with a slightly different set of hardware features (Gen 2). Here is an overview of the current hardware generations:

• Gen 1 Stock
  • 128px x 64px OLED screen
  • No LED indicators on the top side of the device.
• Gen 1 LCD
  • Like Gen 1 Stock but retrofitted with a 240px x 240px LCD screen
  • All of the Gen 1 Stock devices should be modified to this state
• Gen 2
  • 240px x 240px LCD screen
  • LED indicators on the top side of the device

With this PR applied only hardware generations Gen 1 LCD and Gen 2 are supported. Support for Gen 1 Stock is dropped.

Related pull requests

• meta-lxatac: This PR continues the work started in #10 to support Gen 1 LCD and it will thus be closed. There is however an open tasks there that have not yet been addressed:
  • [x] The panel-mipi-dbi recipe should be split into two recpies, one for the tool and one that uses the tool to build the firmware.
• tacd: tacds with the PR linux-automation/tacd#13 applied depend on the devicetree changes made in this PR to run. Merging of the PRs should be done in tandem. In addition to that:
  • [x] Update the tacd recipe to use the upstream repo and main branch with the PR applied.
  • [x] Update the tacd-webinterface recipe to use the upstream repo and main branch with the PR applied.

Other open tasks

• [x] Decide how the RGB status LED on Gen 2 devices should behave during boot. Do we e.g. want: 1) Set a "in progress" color in barebox and change to an "error" color if something fails. 2) Set another "in progress" color in linux or start pulsing in the previous color to indicate the bootloader -> linux change. 3) Set a "sucess" color in linux when e.g. boot-complete.target is reached. Or should this be done in the tacd?
• [x] Clean up …
• [ ] … and review the barebox device detection and devicetree selection
• [x] Clean up …
• [x] … and review the linux devicetree / defconfig changes.
• [x] This PR also upgrades the linux kernel to 6.3 make sure that is released and the recipe is updated to the released version. Or backport the changes to 6.2.
• [x] The tacd.service currently uses fixed gpioset commands to turn off the DUT on failure. This does not work with the Gen 2 powerboard which does not have a GPIO expander. Find a different solution.
• [x] When interacting with a Gen 1 device over the debug port it seemed that barebox as become a bit hard of hearing, e.g. missed a lot of characters. Investigate/fix that. 20230418 lgo: @SmithChart has found out that this is caused by a floating GPIO line for the input button on the powerboard if no power board is connected. The solution is to enable internal pullups for the buttons.

[jluebbe]

I've looked at the Linux defconfig changes and found no issues.