Restore original /soc ranges on Marvell Armada 38x boards

Because fdt_get_ranges can process now multiple 'ranges' entries,
restoring the ranges from original Linux device trees is possible.

Submitted by: Patryk Duda <pdk@semihalf.com>
Reviewed by: cognet (mentor)
Approved by: cognet (mentor)
Obtained from: Semihalf
Differential Revision: https://reviews.freebsd.org/D11877