Add Bazel MODULE files to .gitignore

These are generated automatically by some versions of Bazel, but aren't
used and can be ignored.

Change-Id: I778102d05ad5ab440320460f6b897cd573362d7e
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/github.com/ARM-software/HWCPipe/+/1037693
Reviewed-by: Craig Stout <cstout@google.com>
diff --git a/.gitignore b/.gitignore
index e6065a4..8865a77 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,7 @@
 # Ctags
 .tags
 .tags1
+
+# Bazel modules files
+MODULE.bazel
+MODULE.bazel.lock