platform_ToolchainOptions: prune whitelists.

Many of these files don't exist anymore.

BUG=None
TEST=Passes on expresso, daisy_spring.

Change-Id: I19fbd5b1442ace4974ccd75056d67b3c4b3e1047
Reviewed-on: https://chromium-review.googlesource.com/221544
Commit-Queue: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
3 files changed