DMA, CMA: support arbitrary bitmap granularity

PPC KVM's CMA area management requires arbitrary bitmap granularity,
since they want to reserve very large memory and manage this region with
bitmap that one bit for several pages to reduce management overheads.
So support arbitrary bitmap granularity for following generalization.

[[email protected]: s/1/1UL/]
Signed-off-by: Joonsoo Kim <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Acked-by: Zhang Yanfei <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Reviewed-by: Aneesh Kumar K.V <[email protected]>
Cc: Alexander Graf <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Gleb Natapov <[email protected]>
Acked-by: Marek Szyprowski <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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