Revert "eSEL: Remove unused code related to logging eSEL"

This reverts commit 54fad6de0541c2f98e9b511f1d30bbcbcd743db6.

This commit is reverted because the mapping of D-Bus object path to
sensor information is still needed. The mapping is needed to serve
the SEL commands which translate D-Bus logging objects to SEL entries.

Change-Id: I2505299671db1f0bd7f116ef0e2ca4a0273eead8
diff --git a/Makefile.am b/Makefile.am
index 9a16082..48aa48f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,6 +16,7 @@
 
 libipmi20_BUILT_LIST = \
 	sensor-gen.cpp \
+	inventory-sensor-gen.cpp \
 	fru-read-gen.cpp \
 	channel-gen.cpp