Enable readability-avoid-const-params-in-decls

This check involves explicitly declaring variables const when they're
declared auto, which helps in readability, and makes it more clear that
the variables are const.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I71198ea03850384a389a56ad26f2c4a48c75b148
diff --git a/.clang-tidy b/.clang-tidy
index 0a7f665..953c78e 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -267,6 +267,7 @@
 performance-type-promotion-in-math-fn,
 performance-unnecessary-copy-initialization,
 performance-unnecessary-value-param,
+readability-avoid-const-params-in-decls,
 readability-braces-around-statements,
 readability-const-return-type,
 readability-container-size-empty,