bm_instance: Create a new handler

This OEM handler will get properties from tmpfs to serve over IPMI.

Tested:
~# cat /run/bm-instance/asset-tag
12345
~# ipmitool raw 0x2e 0x32 0x79 0x2b 0x00 0x17 0x00
 79 2b 00 17 05 31 32 33 34 35
...
...
(Verified this works for all 7 sub commands)

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: I191b6f4994d91ada49a3332a8e93a3a305561904
diff --git a/test/meson.build b/test/meson.build
index c3387dd..f7e3bb9 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -31,6 +31,7 @@
   'bmc_mode',
   'linux_boot_done',
   'bm_mode_transition',
+  'bm_instance',
 ]
 
 foreach t : tests