phosphor-logging: Add native SDK classes to install parser scripts

Install elog-gen.py and mako script by default in the
obmc-phosphor-image sdk.

Change-Id: Ibfb94fc4a645bcca66f7b93656edd88a1af5c4f6
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
diff --git a/classes/phosphor-logging.bbclass b/classes/phosphor-logging.bbclass
index 18f53d4..48676f4 100644
--- a/classes/phosphor-logging.bbclass
+++ b/classes/phosphor-logging.bbclass
@@ -1 +1,2 @@
 callouts_datadir="${datadir}/phosphor-logging/callouts"
+elog_dir = "${datadir}/phosphor-logging/elog"