amdgpu: sync up amdgpu_drm.h with latest from kernel

From drm-next:

commit c41219fda6e04255c44d37fd2c0d898c1c46abf1
Merge: e20bb857dea2 d96536f0fe69
Author: Dave Airlie <airlied@redhat.com>
Date:   Thu May 21 10:44:32 2020 +1000

    Merge tag 'drm-intel-next-fixes-2020-05-20' of git://anongit.freedesktop.org/drm/drm-intel

 into drm-next

    Fix for TypeC power domain toggling on resets (Cc: stable).
    Two compile time warning fixes.

Signed-off-by: Dave Airlie <airlied@redhat.com>
    From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20200520123227.GA21104@jlahtine-desk.ger.corp.intel.com



Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>