configurations: Add ASRock n3.xlarge.x86 chassis

This is a single-height (1U) half-width Open19 brick built around an
ASRock SPC621D8HM3 motherboard.

Tested: In an ASRock n3.xlarge.x86 server, all

configurations: Add ASRock n3.xlarge.x86 chassis

This is a single-height (1U) half-width Open19 brick built around an
ASRock SPC621D8HM3 motherboard.

Tested: In an ASRock n3.xlarge.x86 server, all sensors and fans work as
expected.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I57cb8fe0a90a07cb60aff84464875b278e4b86bc

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