[POWERPC] bootwrapper: Add dt_xlate_reg(), and use it to find serial registers.
dt_xlate_reg() uses the ranges properties of a node's parentage to find the absolute physical address of the node's registers. The ns16550 driver uses this when no virtual-reg property is found. Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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