Revert "Clean up the rest of the references to "arc-presubmit""

This reverts commit df001d9d925cd783bb6252523a156055bd8758ab.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Clean up the rest of the references to "arc-presubmit"
>
> I have already removed the suite:arc-presubmit in prior CL.
> But there are something about it I forget to clean up at
> that time.
>
> Bug:26895109
> TEST:
> 1. Try to run suite:arc-presubmit and suite:arc-unit-test.
> 2. Grep the "arc-presubmit" and find nothing to modify.
>
> Change-Id: I51b588e3d66c5cebb3c84ead0340162c6102866f
> Reviewed-on: https://chromium-review.googlesource.com/668996
> Commit-Ready: Xuhui Peng <pengxuhui@google.com>
> Tested-by: Xuhui Peng <pengxuhui@google.com>
> Reviewed-by: Dan Shi <dshi@google.com>

Bug: 26895109
Change-Id: Iaa23b90780bf2363187db9535213bed281870874
Reviewed-on: https://chromium-review.googlesource.com/671725
Commit-Ready: Xuhui Peng <pengxuhui@google.com>
Tested-by: Xuhui Peng <pengxuhui@google.com>
Reviewed-by: Dan Shi <dshi@google.com>
diff --git a/contrib/reverify_unknown b/contrib/reverify_unknown
index 9faa604..aafbafd 100755
--- a/contrib/reverify_unknown
+++ b/contrib/reverify_unknown
@@ -23,7 +23,7 @@
 # Basically, that's any host in the suites, bvt, cq, or pfq pool.
 
 GET_HOSTS='
-  /pool:(suites|bvt|cq|continuous|cts|crosperf|performance)/ {
+  /pool:(suites|bvt|cq|continuous|cts|arc-presubmit|crosperf|performance)/ {
     print $1
   }
 '