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/storagehandler.cpp b/storagehandler.cpp
index 61cf42e..0ac735b 100644
--- a/storagehandler.cpp
+++ b/storagehandler.cpp
@@ -1,6 +1,5 @@
 #include "storagehandler.hpp"
 
-#include "entity_map_json.hpp"
 #include "fruread.hpp"
 #include "read_fru_data.hpp"
 #include "selutility.hpp"
@@ -12,6 +11,7 @@
 #include <systemd/sd-bus.h>
 
 #include <ipmid/api.hpp>
+#include <ipmid/entity_map_json.hpp>
 #include <ipmid/utils.hpp>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/elog.hpp>