Revert "drm/amdgpu: add modifiers in amdgpu_vkms_plane_init()"

This reverts commit 4046afc.

No need to support modifier in virtual kms, otherwise, in SRIOV
mode, when lanuching X server, set crtc will fail due to mismatch
between primary plane modifier and framebuffer modifier.

Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c

@@ -391,7 +391,6 @@ static struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev,
  int index)
 {
  struct drm_plane *plane;
- uint64_t modifiers[] = {DRM_FORMAT_MOD_LINEAR, DRM_FORMAT_MOD_INVALID};
  int ret;
 
  plane = kzalloc(sizeof(*plane), GFP_KERNEL);
@@ -402,7 +401,7 @@ static struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev,
  &amdgpu_vkms_plane_funcs,
  amdgpu_vkms_formats,
  ARRAY_SIZE(amdgpu_vkms_formats),
- modifiers, type, NULL);
+ NULL, type, NULL);
  if (ret) {
  kfree(plane);
  return ERR_PTR(ret);