drm/xe: apply debug page-size allocation policy to user BOs

Apply the debug page-size allocation policy during user BO creation.

When page-size allocation control is enabled, override the user BO
page-size selection flags based on the selected debug mode and round the
requested size up to the corresponding granularity:
  - 2M mode selects 2M handling
  - 1G mode selects 1G handling
  - mixed mode selects the page size from the current mixed-mode index

This is intended for internal debug and validation flows. When the
control mode is left at the default setting, the normal user BO creation
path is unchanged.

v2
- ensure debug page-size allocation does not
  affect the default path (sashiko)
- rework synchronization for concurrent access (sashiko)
- refactor commit message for readability

v3
- update user BO size alignment based on debug policy mode
- reword commit message
- ensure normal user flow is unchanged when debug policy is disabled

v4(sashiko)
- limit debug page-size policy application to VRAM BOs
- do not override preexisting page-size requirement flags
- advance mixed-mode index only after successful
  BO create ioctl completion
- add overflow checks before ALIGN() in debug page-size handling
- ensure CONFIG_DRM_XE_DEBUG_PAGE_SIZE enabled and it is dgfx

v5(Himal)
v5:
- Guard debug page-size policy paths with CONFIG_DRM_XE_DEBUG_PAGE_SIZE
- Leave the normal BO creation path unchanged
  when no debug mode is selected

v8(Himal)
- Avoid current index increment for system BO's
- Simplify mixed mode align logic by changing array to struct array
- Have a inline check if it is on debug mode or not
- Avoid condition compiled debug in function code blocks

Signed-off-by: Nareshkumar Gollakoti <naresh.kumar.g@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patch.msgid.link/20260729121843.1255891-5-naresh.kumar.g@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>

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