Whale: Add IO expanders for whale_samus board

BUG=chrome-os-partner:28870
TEST=check output of 'dut-control -i'

Change-Id: Id2a66dd590913b4f51b7b726010b568ae593c8c6
Reviewed-on: https://chromium-review.googlesource.com/201218
Reviewed-by: Rong Chang <rongchang@chromium.org>
Reviewed-by: Dean Liao <deanliao@chromium.org>
Tested-by: Justin Chuang <jchuang@chromium.org>
Commit-Queue: Justin Chuang <jchuang@chromium.org>
1 file changed