Fix protos compilation failure for the first time.

Change-Id: I07db682ef7d200c3f70e55a952b9366cc09af148
diff --git a/.gitignore b/.gitignore
index 6bf2e45..90f483f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,11 +25,11 @@
 # Test binary
 test_openolt
 
+# proto files
+protos/voltha_protos/*.proto
+
 # Test report
 **/test_openolt_report.xml
 
-# Downloaded voltha-protos file
-voltha_protos
-
 # IntelliJ Files
 .idea