move entity_map_json to libipmid

entity_map_json is used by dbus-sdr sensor handling so it needs to be in
a common location or loading order matters. This change moves the file
from the ipmi20 provider library to libipmi, a common library.

Tested: Found that even though the dbus-sdr provider loads before
        ipmi20, it loads properly without missing symbols.

Change-Id: I9ab6833c78e6f3c89c02cf998ce0a36353059c3d
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/dbus-sdr/meson.build b/dbus-sdr/meson.build
index bfdbde1..b8dce8e 100644
--- a/dbus-sdr/meson.build
+++ b/dbus-sdr/meson.build
@@ -10,9 +10,9 @@
   include_directories: root_inc,
   dependencies: [
     crypto,
+    nlohmann_json_dep,
     phosphor_logging_dep,
     ipmid_dep,
-    libipmi20_dep,
     sensorutils_dep,
   ])