[DistroKit] [PATCH v2 0/7] v8a: imx8m: add i.MX8MP based TQ MBa8MPxL board

["Leonard Göhrs" <l.goehrs@pengutronix.de>]

This adds support for the i.MX8MP based MBa8MPxL[1] by TQ.

This board uses another UART than e.g. the NXP EVK boards
for debug output. This is why we need a tf-a patch that
automatically selects the UART at runtime based on which one
is already enabled. 

While at it I've also added a barebox state partition for all
other i.MX8M images, to prepare them for RAUC support
and added RAUC support for the MBa8MPxL.

This patch series is built upon Ahmads series[2] that
updates barebox and cleans up its configuration,
so that should be merged first to prevent conflicts.

Changes from v1 to v2:

  - Add an (admittedly untested) i.MX8MQ version of the tf-a
    UART auto detection patch and use "IMX_BOOT_UART_BASE=auto"
    instead of "IMX_BOOT_UART_BASE=0".
    The variant in v1 with "IMX_BOOT_UART_BASE=0" would previously
    have silently broken support on i.MX8MQ.
  - More changes to the partition layout based on the given feedback.
  - Simplified "barebox-common-defaultenv/init/bootsource".

[1]: https://www.tq-group.com/en/products/tq-embedded/arm-architecture/mba8mpxl/
[2]: https://lore.distrokit.org/distrokit/20240102154603.3678357-1-a.fatoum@pengutronix.de/T/#t