Revert "drm/amdgpu: use dirty framebuffer helper"

This reverts commit c89849ec which is
commit 66f99628eb24409cb8feb5061f78283c8b65f820 upstream.

It is reported to cause problems on 5.4.y so it should be reverted for
now.

Reported-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/7af02bc3-c0f2-7326-e467-02549e88c9ce@linuxfoundation.org


Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>