rm: boards: stm32 eval: fix flashing instructions

[vanmaegima]

The flash layouts file was renamed to FlashLayout_emmc.tsv. Explicitly enter the correct directory to run the flashing command.

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[doanac]

Docs for 76fb049 are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2803/docs/artifacts/html/index.html

[vanmaegima]

I'm unsure if the renaming is correct or if we are just not publishing the correct flashlayout file, can you confirm @igoropaniuk ?
After testing, I see that flashing from the FlashLayout_emmc.tsv file does not work at least for the published v94.1 release.

[igoropaniuk]

@vanmaegima I'll take a look.
If you still have a flashing log (or at least the error message you're observing), could you share it?

[vanmaegima]

As discussed on Slack, this seems to be related to flashing unsigned -sec binaries on an open board. I will re-test it and report back.

[kprosise]

LGTM