Allow clang-tidy warnings.

Upstream source still have some clang-tidy warnings.
We do not want to stop Android builds on clang-tidy warnings.

Bug: 252877310
Test: TIDY_EXTERNAL_VENDOR=1 make tidy-external_subset
Change-Id: Ibb076b7c9dbb3c935a9b108681a9ab459bff42ef
diff --git a/.clang-tidy b/.clang-tidy
index 3731a29..e1d92ed 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,6 +1,3 @@
-# Turn all the warnings from the checks above into errors.
-WarningsAsErrors: "*"
-
 #HeaderFilterRegex: "^.*external/drm_hwcomposer/.*.h$"
 
 FormatStyle: google