drm/amdgpu/gfx11: Adjust gfxoff before powergating on gfx11 as well

drm/amdgpu/gfx11: Adjust gfxoff before powergating on gfx11 as well

BugLink: https://bugs.launchpad.net/bugs/2028808
commit 11fbdda2ab6bf049e2869139c07016022b4e045b upstream.

(Bas: speculative change to mirror gfx10/gfx9)

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.1.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>