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 provi

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>

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