md: Replace deprecated kmap_atomic() with kmap_local_page()

kmap_atomic() is deprecated and should be replaced with kmap_local_page()
[1][2]. kmap_local_page() is faster in kernels with HIGHMEM enabled, can
take page faults, and allows preemption.

According to [2], this is safe as long as the code between kmap_atomic()
and kunmap_atomic() does not implicitly depend on disabling page faults or
preemption. It appears to me that none of the call sites in this patch
depend on disabling page faults or preemption; they are all mapping a page
to simply extract some information from it or print some debug info.

[1] https://lwn.net/Articles/836144/
[2] https://docs.kernel.org/mm/highmem.html#temporary-virtual-mappings

Signed-off-by: David Reaver <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Song Liu <[email protected]>

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