libethdrivers,imx: Reintroduce ethif_imx6_init

[kent-mcleod]

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This init function is used by ethif_new_lwip_driver and was previously removed in an earlier refactor. This commit reintroduces it.

Signed-off-by: Kent McLeod [email protected]

[axel-h]

As a follow-up, should we have a CI test that a system using LWIP still builds? Since i.MX6 i supported in QEMU, we could later even add a check that this actually works

[kent-mcleod]

As a follow-up, should we have a CI test that a system using LWIP still builds? Since i.MX6 i supported in QEMU, we could later even add a check that this actually works

This would be the closest: https://github.com/seL4/camkes/pull/13

[axel-h]

I'm fine with merging this when the style issue and the missing return are addressed. Leaving the include file for now is a nice-to-have thing.

[axel-h]

@kent-mcleod: do you want to merge this?