BACKPORT: CHROMIUM: drm/anx7808: Correct the DDC Aux channel command.

The reference code uses both 0x00 and 0x04 commands while reading EDID, but the
correct command for reading EDID is 0x04.

BUG=chrome-os-partner:22941,chromium:396912
TEST=Tested on NS-L37Q-10A (which failed before) as well as ASUS and DELL
monitors (which succeeded before).  EDID is read and display shows video.

Change-Id: I55e59f49585310b99dd62a2ee7dfa15bf8bed0b1
Signed-off-by: Jeremy Thorpe <jeremyt@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/171752
Reviewed-by: Sean Paul <seanpaul@chromium.org>
(cherry picked from commit 2d6d7c0ce12b8b2def96193f10a34a361c52df5e)
Signed-off-by: Dominik Behr <dbehr@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/216555
Merge branch 'chromeos-3.8' of https://chromium.googlesource.com/chromiumos/third_party/kernel into chromeos-3.8