kerf: parse explicit-width CPU cells in DTS inputs

[nickolaev]

Summary

• Accept legacy, decimal, hexadecimal, /bits/ 32, and /bits/ 64 CPU-cell declarations in DTS inputs.
• Apply the same parser to root resources, instance resources, NUMA-node membership, and core topology.
• Parse nested topology sections with brace matching and ignore DTS comments inside cell lists.
• Keep the change focused to one compatibility commit on current multikernel/kerf main.

Validation

• 268 tests passed, 1 skipped.
• Pylint 10.00/10.
• The compatibility patch passed the full multikernel SR-IOV QEMU lifecycle on the ARM64 host; the final upstream rebase only removes hand-written example files.

[congwang-mk]

Sorry for being late. This PR was for SR-IOV, hence I was waiting for the kernel part to settle down before reviewing this, as the interface could be changed during the review.

But now since you changed it to CPU topology, it is coincidentally same with #12 . Please let me know what's your preference to move forward, I am happy to drop mine since it is not complete either. @nickolaev If you prefer to move forward with this one, please at least do a rebase.

By the way: the memory allocation policy must be global, so can't be specified during every kerf create, it has to be in kerf init and saved in the root device_tree file (ignored by kernel). I made the same mistake during design.