Support to use lg2 logging

Change-Id: I3a11433fa6bbbad165a65037b9253eda7206f946
diff --git a/.gitignore b/.gitignore
index 8d2357a..296dc9b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /build
 /subprojects/googletest
 /subprojects/libhei
+/subprojects/phosphor-logging