drm/xe/tests: add live KUnit coverage for BO page-size allocation modes

Add live KUnit coverage for the debug-controlled BO
    page-size allocation modes.

    The new tests cover forced 2M mode, forced 1G mode,
    and mixed mode. They verify that user BO creation applies
    the expected NEEDS_* flags, that no unexpected page-size flags are
    added in the forced modes, that BO size is rounded as expected, and
    that page_alignment matches the selected leaf size.

    The mixed-mode test does not assume a strict per-allocation rotation
    sequence, since the device-global mixed-mode index may be perturbed by
    concurrent BO creation on a live system. Instead,
    it validates that each allocation results in
    one valid mixed-mode page-size outcome.

    Treat transient VRAM allocation failures as skipped test cases so the
    tests can run in varying live environments without producing false
    failures.

    v3
    - address review comments
    - rework mixed-mode test to avoid assuming strict rotation order
    - reword commit message
    v4
    - skip VRAM-targeted live tests on non-dGFX devices
    v5
    - advance the mixed-mode index in the test
    v6
    - Gaurd kunit tests under CONFIG_DRM_XE_DEBUG_PAGE_SIZE
    v9
    - consider XE_VRAM_FLAGS_NEED64K in mixed mode for certain
      platoform min alignment expectations.

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/20260729121843.1255891-7-naresh.kumar.g@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>

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