This adds the devfreq get_cur_freq function since the devfreq driver gets out of sync with the clk rate when it is disabled. BUG=chrome-os-partner:46207 TEST=on minnie, repeat several times: plug in hdmi monitor check that 'cat /sys/class/devfreq/ff610000.dmc/cur_freq' returns 533000000 Change-Id: I21a7d67eb183bf43b9c7a13a0c257d1097dd3cae Signed-off-by: Derek Basehore <dbasehore@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/304367 Reviewed-by: Douglas Anderson <dianders@chromium.org>