Add enumeration for PLDM entity types

Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
Change-Id: I5b7e2306a3d099d3fd04a7eb088e8764afe84d7f
diff --git a/libpldm/meson.build b/libpldm/meson.build
index 7c072a2..b253bfb 100644
--- a/libpldm/meson.build
+++ b/libpldm/meson.build
@@ -4,6 +4,7 @@
   'platform.h',
   'bios.h',
   'bios_table.h',
+  'entity.h',
   'states.h',
   'fru.h',
   'utils.h',