cros: remove one unused include rule from ash/DEPS

Bug: None
Test: trybot
Change-Id: Icc705f01e2742f02fa58cd2107efdbb0733860c0
Reviewed-on: https://chromium-review.googlesource.com/1052380Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Qiang Xu <warx@google.com>
Cr-Commit-Position: refs/heads/master@{#557237}

ash/DEPS

@@ -133,9 +133,6 @@ specific_include_rules = {
     "+ash/host/ash_window_tree_host_mus_mirroring_unified.h",
     "+ash/host/ash_window_tree_host_mus_unified.h",
   ],
-  "touch_transformer_controller\.*": [
-    "+ash/host"
-  ],
   "window_manager.cc": [
     "+ash/host/ash_window_tree_host.h"
   ],