drm/xe: reset mmio mappings with devm

[ Upstream commit c7117419784f612d59ee565145f722e8b5541fe6 ]

Set our various mmio mappings to NULL. This should make it easier to
catch something rogue trying to mess with mmio after device removal. For
example, we might unmap everything and then start hitting some mmio
address which has already been unmamped by us and then remapped by
something else, causing all kinds of carnage.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522102143.128069-33-matthew.auld@intel.com


Stable-dep-of: 15939ca77d44 ("drm/xe: Fix tile fini sequence")
Signed-off-by: Sasha Levin <sashal@kernel.org>