Adding dependency to tablet_mode suite

Adding lable dependency 'accel:cros-ec' to tablet_mode test suite

BUG=chromium:710262
TEST=None

Change-Id: I93db6584a26888c0e51fcd6b5dec0411d5ffe840
Reviewed-on: https://chromium-review.googlesource.com/481883
Commit-Ready: Ruchi Jahagirdar <rjahagir@chromium.org>
Tested-by: Ruchi Jahagirdar <rjahagir@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>
diff --git a/test_suites/control.tablet_mode b/test_suites/control.tablet_mode
index 6c1f35e..9be39f5 100644
--- a/test_suites/control.tablet_mode
+++ b/test_suites/control.tablet_mode
@@ -44,6 +44,7 @@
     'cc': ['kalin@chromium.org']
 }
 
+args_dict['suite_dependencies'] = 'accel:cros-ec'
 args_dict['add_experimental'] = True
 args_dict['bug_template'] = _BUG_TEMPLATE
 args_dict['job'] = job