configurations: Add ASRock E3C256D4I board

This is a relatively low-cost off-the-shelf Xeon motherboard, not unlike
the E3C246D4I (but updated).

Tested: In an ASRock m3.small.x86 server (which is b

configurations: Add ASRock E3C256D4I board

This is a relatively low-cost off-the-shelf Xeon motherboard, not unlike
the E3C246D4I (but updated).

Tested: In an ASRock m3.small.x86 server (which is built around this
board), all sensors work as expected.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Change-Id: I0dcb1a80cc0518f5bfad4ace548d553d0f23f3e5

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