configurations: nf5280m7: add baseboard json

Tested:
```
root@nf5280m7:~# busctl tree xyz.openbmc_project.EntityManager
`- /xyz
  `- /xyz/openbmc_project
    |- /xyz/openbmc_project/EntityManager
    `- /xyz/openbmc_project/inventory
      `- /xyz/openbmc_project/inventory/system
        `- /xyz/openbmc_project/inventory/system/chassis
          `- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/CPU0
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/CPU0_Volt
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/CPU1
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/CPU1_Volt
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/Inlet_Temp
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/Outlet_Temp
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PCH_STBY
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PCH_Temp
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PSU0
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PSU1
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCD_HV_CPU0
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCD_HV_CPU1
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCINFAON_CPU0
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCINFAON_CPU1
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCIN_CPU0
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/PVCCIN_CPU1
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/RTC_Battery
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/SYS_12V
            |- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/SYS_3V3
            `- /xyz/openbmc_project/inventory/system/chassis/nf5280m7_baseboard/SYS_5V
```

Change-Id: Iceabbbb8d8b38f2be47e3d3c283a391f418a507f
Signed-off-by: Tao Lin <lintao.lc@ieisystem.com>
diff --git a/meson.build b/meson.build
index ac8b2e3..c6d5160 100644
--- a/meson.build
+++ b/meson.build
@@ -155,6 +155,7 @@
     'mtmitchell_bmc.json',
     'mtmitchell_mb.json',
     'mudflap.json',
+    'nf5280m7_baseboard.json',
     'nisqually.json',
     'nuvoton_npcm8xx_evb.json',
     'nvme_intel_p_series.json',