Enable parsing simple-bus 'ranges' with multiple entries

[mw]

Summary

This patch makes possible to boot with up to 8 ranges in soc.
Dynamic allocation cannot be used, because ftd_get_ranges
function is called early, when malloc is not available.

Change is required for the alignment of Marvell Armada 38x
device trees present in sys/gnu/dts/arm - originally
the platform has 6 entries in simple-bus 'ranges'.

[manu]

Add Nathan as he is the maintainer of ofw.

[mw]

Hi @nwhitehorn - do you have any objections to the patch?

[nwhitehorn]

Looks good. We may need to think some more about the implementation of this function if we need to bump it again, but I cannot think of a better approach offhand.

As a general comment, we should eventually remove all of these fdt_* functions, since they duplicate the equivalent OF_* and ofw_* functions in dev/ofw. The existing code is there for compat with old code only.