drm/rockchip: shutdown drm subsystem on shutdown

As explained by Robin Murphy:
> the IOMMU shutdown disables paging, so if the VOP is still
> scanning out then that will result in whatever IOVAs it was using now going
> straight out onto the bus as physical addresses.

We had a more radical approach before in commit
7f3ef5dedb14 ("drm/rockchip: Allow driver to be shutdown on reboot/kexec")
but that resulted in new warnings and oopses on shutdown on rk3399
chromeos devices.

So second try is resurrecting Vicentes shutdown change which should
achieve the same result but in a less drastic way.

Fixes: 63238173b2fa ("Revert "drm/rockchip: Allow driver to be shutdown on reboot/kexec"")
Cc: Jeffy Chen <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: Doug Anderson <[email protected]>
Cc: [email protected]
Suggested-by: JeffyChen <[email protected]>
Suggested-by: Robin Murphy <[email protected]>
Signed-off-by: Vicente Bergas <[email protected]>
[adapted commit message to explain the history]
Signed-off-by: Heiko Stuebner <[email protected]>
Tested-by: Brian Norris <[email protected]>
Tested-by: Douglas Anderson <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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