configurations: Split out ASRock c3.medium/m3.large chassis

Previously the romed8hm3 board config inappropriately included
components from the Open19 c3.medium.x86/m3.large.x86 chassis. Add a
confi

configurations: Split out ASRock c3.medium/m3.large chassis

Previously the romed8hm3 board config inappropriately included
components from the Open19 c3.medium.x86/m3.large.x86 chassis. Add a
config for the chassis and move the chassis components from the board
config to it.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I3833bbf810b5e33b409110b867c09e1ca2f45ae2

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