drm/xe: Wire up dmem cgroup reclaim for VRAM manager

Register the VRAM manager with the dmem cgroup reclaim infrastructure
so that lowering dmem.max below current VRAM usage triggers TTM
eviction rather than failing with -EBUSY.

v4:
- Rebased on drm-tip; dropped the XE_PL_STOLEN guard as stolen memory
  uses a separate TTM manager and never calls __xe_ttm_vram_mgr_init().

v5:
- Rebased on the introduction of struct dmem_cgroup_init.
- Register the fini drmm action before drmm_cgroup_register_region() so
  that devres LIFO teardown runs unregister_region() first (draining any
  in-flight reclaim callbacks via the rwsem) and xe_ttm_vram_mgr_fini()
  second, ensuring the manager is never accessed by a reclaim callback
  after teardown. (Sashiko-bot)
- Wrap the reclaim callback in xe_ttm_vram_mgr_dmem_reclaim() using
  drm_dev_enter()/drm_dev_exit() to prevent TTM reclaim from running
  after driver unbind.

v9:
- Close ttm_resource_manager_set_used() races around vram manager
  init and fini.
- Formatting fix.
- Acquire a runtime PM reference around the TTM reclaim call in
  xe_ttm_vram_mgr_dmem_reclaim(). (Sashiko-bot)

Assisted-by: GitHub_Copilot:claude-sonnet-4.6
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> #v8
Tested-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Link: https://patch.msgid.link/20260725100036.2372-6-thomas.hellstrom@linux.intel.com
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>

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