drm/i915/gtt: ignore min_page_size for paging structures

The min_page_size is only needed for pages inserted into the GTT, and
for our paging structures we only need at most 4K bytes, so simply
ignore the min_page_size restrictions here, otherwise we might see some
severe overallocation on some devices.

v2(Thomas): add some commentary

Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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