meta-lxatac-bsp: linux-lxatac: upgrade to 6.9

[hnez]

umpf tag is now: 6.9/customers/lxa/lxatac/20240514-1 The tag includes the following topic branches:

• v6.8/topic/reproducible-build
• v6.7/topic/net-ksz-switch
• v6.9/topic/stm32mp1-spi-fix-hang
• v6.8/customers/lxa/lxatac

This means we got rid of two topic branches, thanks to Uwe's mainlining efforts, but gained one new topic branch:

• v6.9/topic/stm32mp1-spi-fix-hang

  This topic branch reverts kernel commit 52b62e7a5d4fb ("spi: stm32: enable controller before asserting CS") which broke SPI on the LXA TAC. The issue has been reported upstream and the offending commit will likely be reverted upstream as well.

The series.inc file generated by umpf has again changed a bit and does not set the package PV anymore. Since we have already migrated to using the series.inc-provided PV the linux-lxatac.bb was adapted to preserve the previous behaviour.

TODO before merging:

• [x] Since this is a PR into the new scarthgap branch, that does not yet contain scarthgap-y content #137 should be merged first, which performs the scarthgap update.

[hnez]

Hi, now that #137 is merged and the dust has settled (default branches are updated, build jobs are updated and ran successfully, labgrid tests are updated and also ran fine and the first scarthgap based testing bundle is available and installable) we can go ahead and merge this PR as well..

[hnez]

I've just noticed that this PR is still open. I think we should get this merged.

[hnez]

@hnez Is 0503-ARM-dts-stm32-lxa-tac-reduce-RGMII-interface-drive-s.patch no longer needed?

I've had a look and it is actually no longer needed, since https://lore.kernel.org/all/20240304135612.814404-1-o.rempel@pengutronix.de/ was merged between 6.8 and 6.9. That must have slipped through when writing the update commit message.