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
diff --git a/meson.build b/meson.build
index 8b034db..f282254 100644
--- a/meson.build
+++ b/meson.build
@@ -81,6 +81,7 @@
     'acbel_r1ca2122a_psu.json',
     'asrock_e3c246d4i.json',
     'asrock_e3c256d4i.json',
+    'asrock_m3_small_x86.json',
     'asrock_n3_xlarge_x86.json',
     'asrock_romed8hm3.json',
     'asrock_spc621d8hm3.json',