drm/xe/migrate: Add kunit to test clear functionality

This test verifies if the main and ccs data are cleared during bo creation.
The motivation to use Kunit instead of IGT is that, although we can verify
whether the data is zero following bo creation,
we cannot confirm whether the zero value after bo creation is the result of
our clear function or simply because the initial data present was zero.

v2: Updated the mutex_lock and unlock logic,
    Changed out_unlock to out_put. (Matt)

v3: Added missing dma_fence_put(). (Nirmoy)

v4: Rebase.

v5: Add missing bo_put(), bo_unlock() calls. (Matt Auld)

Signed-off-by: Akshata Jahagirdar <[email protected]>
Reviewed-by: Himal Prasad Ghimiray <[email protected]>
Acked-by: Nirmoy Das <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/c07603439b88cfc99e78c0e2069327e65d5aa87d.1721250309.git.akshata.jahagirdar@intel.com

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