configurations: Add ASRock m3.small.x86 chassis

This is a single-height (1U) half-width Open19 brick built around an
ASRock E3C256D4I motherboard.

Tested: In an ASRock m3.small.x86 server, all sens

configurations: Add ASRock m3.small.x86 chassis

This is a single-height (1U) half-width Open19 brick built around an
ASRock E3C256D4I motherboard.

Tested: In an ASRock m3.small.x86 server, all sensors and fans work as
expected.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: Ife56d8486835bbcdf561973b6d735485b7e4f3fd

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