memblock: Move memblock arrays to static storage in memblock.c and make their size...

This is in preparation for having resizable arrays.

Note that we still allocate one more than needed, this is unchanged from
the previous implementation.

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

diff --cc include/linux/memblock.h
Simple merge

diff --cc mm/memblock.c
Simple merge