FROMLIST: spi: rockchip: support "sleep" pin configuration

In the pattern of many other devices, support a system-sleep pin
configuration.

Signed-off-by: Brian Norris <briannorris@chromium.org>
(am from https://patchwork.kernel.org/patch/9478765/)

BUG=chrome-os-partner:57262
TEST=check dev_dbg() messages for pinctrl driver

Change-Id: I81721af6cbabe0d74ceb220f0ee9cc4ef3b4556e
Reviewed-on: https://chromium-review.googlesource.com/421568
Commit-Ready: Caesar Wang <wxt@rock-chips.com>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
2 files changed