PRESUBMIT.cfg: simplify `cros` lookup

Since this will always be in $PATH, we don't need to hardcode the path to it.

Change-Id: If92e4b3f4c6b1eb02b8dec792a6172573132fbf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/docs/+/2225744
Reviewed-by: Michael Mortensen <mmortensen@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/PRESUBMIT.cfg b/PRESUBMIT.cfg
index bd7da9b..d6b4eee 100644
--- a/PRESUBMIT.cfg
+++ b/PRESUBMIT.cfg
@@ -1,5 +1,5 @@
 [Hook Scripts]
-cros lint = ../chromite/bin/cros lint ${PRESUBMIT_FILES}
+cros lint = cros lint ${PRESUBMIT_FILES}
 
 [Hook Overrides]
 bug_field_check = false