i915: convert i915_gpu_error to use a folio_batch

Remove one of the last remaining users of pagevec.

Link: https://lkml.kernel.org/r/20230621164557.3510324-9-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>