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
diff --git a/meson.build b/meson.build
index c0f649f..8b034db 100644
--- a/meson.build
+++ b/meson.build
@@ -80,6 +80,7 @@
     'acbell_rica_psu.json',
     'acbel_r1ca2122a_psu.json',
     'asrock_e3c246d4i.json',
+    'asrock_e3c256d4i.json',
     'asrock_n3_xlarge_x86.json',
     'asrock_romed8hm3.json',
     'asrock_spc621d8hm3.json',