drm/i915: remove unnecessary includes of intel_display_types.h header

With its original name intel_drv.h the intel_display_types.h header was
superfluously cargo-cult included all over the place, while it's really
mostly about display internals. Remove the unnecessary includes.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e3d737f0ab87c55969e62c1e077e15c04c238297.1565085692.git.jani.nikula@intel.com