imx93: add fixes to enable multilib out-of-the-box

[jmarcoscosta]

Hello,

I have been trying to build a 32-bit userspace + 64-bit kernel system through multilib. However, this feature doesn't seem to work out-of-the-box, and some fixes were needed so I could have a flawless build. The target I used in this context was lib32-core-image-minimal.

The main goal of this PR is to fix erroneous overrides that end up using the userspace architecture. Those overrides are not taken into consideration if the userspace architecture is something other than aarch64.

Best regards, João

[jmarcoscosta]

Update: the override I previously used was restricted to iMX9, even though iMX8 is also aarch64, and that would break the build for iMX8.

I added a new override, namely imx-aarch64 to represent them both, and updated the following commits to use it instead of mx9-generic-bsp.

[otavio]

Thank you for your work on this pull request. However, I would prefer to explicitly keep the overrides. Would you mind reworking it to use mx8-generic-bsp and mx9-generic-bsp?

[jmarcoscosta]

Hello, @otavio

I'm not sure if I understood you correctly. Did you mean having each variable defined twice, using the two overrides?

Like this:

foo:mx8-generic-bsp = "bar"
foo:mx9-generic-bsp = "bar"

Best regards, João

[otavio]

@jmarcoscosta exactly! 👍🏻

[jmarcoscosta]

PR updated.