CHROMIUM: drm: bridge/dw_hdmi: fix i2cm standard mode setting error

CHROMIUM: drm: bridge/dw_hdmi: fix i2cm standard mode setting error

I have uploaded a patch to switch DDC to standard mode in
(https://chromium-review.googlesource.com/298270), but that change
have influence the "spare register" in I2CM_DIV, I know this haven't
cause some know bug, but we need to fix it.

BUG=chrome-os-partner:34741
TEST=None

Change-Id: Iff678fb49828db9b8026422e302a03f687a7c862
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/302751
Commit-Ready: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>