missing submodule dependency

[Connor Rigby]

error: Server does not allow request for unadvertised object 8fb3448f6878dec1e7dec4abb786596e011720e3
Fetched in submodule path '3rdparty/arm-trusted-firmware', but it did not contain 8fb3448f6878dec1e7dec4abb786596e011720e3. Direct fetching of that commit failed.

[Pierre Bourdon]

Should be fixed by fail0verflow/switch-coreboot@cdf2652

Thanks for the report.