Revert "drm/i915: Add .get_hw_state() method for planes"

This reverts commit 19d8e5122fefc3e424050a78063f0d385433e191.

Prepare for merge of v4.14.20 into chromeos-4.14. Don't take i915 patches
from upstream stable releases since there are too many local changes.

BUG=chromium:812853
TEST=Build and boot

Signed-off-by: Guenter Roeck <groeck@chromium.org>
3 files changed