memblock: Fix memblock_is_region_reserved() to return a boolean

All callers expect a boolean result which is true if the region
overlaps a reserved region. However, the implementation actually
returns -1 if there is no overlap, and a region index (0 based)
if there is.

Make it behave as callers (and common sense) expect.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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