Make probe_cores deal with an unconfigured FPGA (and come back later).

See, reading from an unconfigured FPGA returns all-1, while reading from
empty cores on a configured FPGA returns all-0. The consequence of this is
that the HSM was probing the FPGA once on startup, filling its core table
with 0xff, rendering the FPGA useless.

Along the way, I put the FPGA core table in static memory, rather than
malloc'ing it, because that's not so good in an embedded environment.
But I kept the linked list, because that at least tells us what to do if
HAL_STATIC_CORE_STATE_BLOCKS is 0.

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