dm-bufio: use kmalloc to allocate power-of-two sized buffers

Vlastimil Babka said [1] that kmalloc will return a power-of-two-aligned
buffer if it was called with a power-of-two size. So, we can use kmalloc
instead of our own slab cache in dm-bufio. Note that the code for the
slab cache was not removed because dm-bufio supports non-power-of-two
buffer sizes.

Link: https://lore.kernel.org/linux-mm/[email protected]/ [1]

Signed-off-by: Mikulas Patocka <[email protected]>

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