ANDROID: allmodconfig: disable WERROR

-Werror still fails on some arm and arm64 code due to clang issues
(works on gcc!), so disable it when building allmodconfig builds for
now.

Hopefully the clang developers will work on this...

Bug: 199872592
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I6ccc856773c40e3c0f541a1316b20e9ae3de4380