drm/i915/error: skip non-mappable pages

Skip capturing any lmem pages that can't be copied using the CPU. This
in now only best effort on platforms that have small BAR.

Testcase: igt@gem-exec-capture@capture-invisible
Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Jon Bloomfield <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Cc: Akeem G Abodunrin <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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