CHROMIUM: drm/evdi: add 32-bit ioctl compatibility routines.

Module drm/evdi defines several ioctl structs containing user pointers. These
require special handling for 32-bit ioctl compatibility.

BUG=chrome-os-partner:59063
TEST=connect elm to DL3 docking station with HDMI TV

Change-Id: I8dca1f1ea851bc11a4b24192d5959a7aab03e4b8
Signed-off-by: Haixia Shi <hshi@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/406013
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
(cherry picked from commit a84fb131cefe054ba942f21cd068791d4e736569)
Reviewed-on: https://chromium-review.googlesource.com/407123
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>