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
diff --git a/meson.build b/meson.build
index e42a4e4..dbfc82b 100644
--- a/meson.build
+++ b/meson.build
@@ -80,6 +80,7 @@
     'acbell_rica_psu.json',
     'acbel_r1ca2122a_psu.json',
     'asrock_e3c246d4i.json',
+    'asrock_n3_xlarge_x86.json',
     'asrock_romed8hm3.json',
     'asrock_spc621d8hm3.json',
     'bletchley_baseboard.json',