fix(schema): Add missing linux-armhf to tools_schema (IDFGH-13036)

[tomstokes]

Adds linux-armhf to the list of platforms that can have overrides.

Fixes #13981

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[mfialaf]

@tomstokes Thank you for spotting and fixing it!

[mfialaf]

sha=84814fd55482c37ebfc29d12a2234958b21a1cba

[dobairoland]

sha=84814fd55482c37ebfc29d12a2234958b21a1cba