Enable readability-named-parameter checks

We don't have too many violations here, probably because we don't have
many optional parameters.  Fix the existing instances, and enable the
check.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I4d512f0ec90b060fb60a42fe3cd6ba72fb6c6bcb
diff --git a/.clang-tidy b/.clang-tidy
index 516ffef..ffb6b06 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -273,6 +273,7 @@
 readability-delete-null-pointer,
 readability-deleted-default,
 readability-else-after-return,
+readability-named-parameter,
 readability-identifier-naming'
 
 WarningsAsErrors: '*'