[coreboot] New name for have_resources

[Myles Watson]

unsigned int    have_resources : 1; /* Set if we have read the devices'
resources. */

Can we think of a new name that makes it clear that this tells if the
resources have been read, not if there are resources?

I don't like read_resources because it's unclear that it should be past
tense.

Thanks,
Myles