[coreboot] Resource Allocation in v3

[Myles Watson]

This patch has been languishing while I've been trying to hash out the dts
stuff.

The basic idea of this patch is that it splits resource allocation into
three passes:
Read
Sum
Assign

This puts code with my mail from last week.

It applies to head and compiles.  It does a fairly good job on serengeti
(the same allocations as before).  I haven't tried it on other platforms.

Signed-off-by: Myles Watson

Thanks,
Myles