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The devicetree binding document[1] for the /reserved-memory node demands
that the number of address and size-cells in the reserved-memory node
must match those values in the root node. So far we were forcing a
64-bit address along with a 32-bit size.

Adjust the code to query the cells values from the root node, and
populate the newly created /reserved-memory node accordingly.

This fixes the fdt_add_reserved_memory() function when called on a
devicetree which does not use the 2/1 pair. Linux is picky about this
and will bail out the parsing routine, effectively ignoring the
reserved-memory node:
[    0.000000] OF: fdt: Reserved memory: unsupported node format, ignoring

[1] Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
    in the Linux kernel source tree

Change-Id: Ie126ebab4f3fedd48e12c9ed4bd8fa123acc86d3
Signed-off-by: Andre Przywara <andre.przywara@arm.com>