drm/i915/uapi: expose GTT alignment

On some platforms we potentially have different alignment restrictions
depending on the memory type. We also now have different alignment
restrictions for the same region across different kernel versions.
Extend the region query to return the minimum required GTT alignment.

Testcase: igt@gem_create@create-ext-placement-alignment
Testcase: igt@i915_query@query-regions-sanity-check
Suggested-by: Lionel Landwerlin <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Cc: Michal Mrozek <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Stuart Summers <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Yang A Shi <[email protected]>
Cc: Nirmoy Das <[email protected]>
Cc: Niranjana Vishwanathapura <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Acked-by: Jordan Justen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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