Introduce ofw_bus_reg_to_rl() to replace part of common bus code

[zbb]

Summary

Instead of reusing the same reg parsing code, create one, common function that puts reg contents to the resource list.
Address cells and size cells are passed rather than acquired here so that any bus can have different default values.

[• ian]

thanks for doing this, I meant to do it after I did the intr_to_rl, and just forgot.

sys/dev/ofw/ofw_bus_subr.c

412

this is passing uint64_t values to an api that takes 32-bit values on some arches, we'll probably need to cast to u_long to avoid warnings. hmm, then again maybe not, I guess the old code was the same.

[nwhitehorn]

Looks good to me.

[zbb]

Thanks.

Committed to r277098