configurations: Add Nuvoton Arbel BMC configuration

Introduce initial configuration file for Arbel BMC.

- Add nuvoton_arbel_bmc.json in configurations
- Update meson.build

Tested:
root@evb-npcm845:/# busctl tree xyz.openbmc_project.EntityManager
|- /xyz/openbmc_project
  |- /xyz/openbmc_project/EntityManager
    |- /xyz/openbmc_project/inventory/system/board/EVB_ARBEL_NUVOTON

Change-Id: Idf2c9331b02284fc336da6466a4a837046af0633
Signed-off-by: Tim Lee <timlee660101@gmail.com>
diff --git a/meson.build b/meson.build
index 7055b5d..a966025 100644
--- a/meson.build
+++ b/meson.build
@@ -150,6 +150,7 @@
     'mtmitchell_mb.json',
     'mudflap.json',
     'nisqually.json',
+    'nuvoton_arbel_bmc.json',
     'nvme_intel_p_series.json',
     'nvme_p4500_p5500.json',
     'pcie_ssd_retimer.json',