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Add virtual wire power signals support for skylake. By adding CONFIG_VW_SIGNALS definition in board level driver, we can save three GPIOs (SLP_S3/SLP_S4/CLK_RUN) on skylake platform. Modified sources: 1. common.c: Add support for VW power signals. 2. skylake.c: Add upper func to get system sleep state through GPIOs or VWs. BRANCH=none BUG=none TEST=make buildall; test boot up and shut down on eSPI POC of wheatley. Change-Id: I0eae363dad8cec011eb32929a40701f19fde7e1a Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/366711 Reviewed-by: Randall Spangler <rspangler@chromium.org>