gitignore: add ipmi-whitelist.hpp

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Iae479fc8503daf3ba13c5b8a76f72d27ae860d1f
diff --git a/.gitignore b/.gitignore
index 1f601f0..5d0281d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,4 @@
 phosphor-ipmi-host-src/
 prefix/
 runSensorTests
+ipmi-whitelist.hpp