Support DefDataRegion

[IsaacWoods]

These are special op regions that actually point to an ACPI table in the RSDT/XSDT. I guess we'll need a method on the handler that asks the OS to retrieve a mapping to the ACPI table, and give us the address to construct a op region from.

• [ ] Parse opcode
• [ ] Create handler method to ask for ACPI table
• [ ] Construct and insert an op region from that info