ACPICA: iASL: NHLT: Treat Terminator as specific_config

ACPICA commit 23a659e190cf3ed0edd46cddf12bbbcfeaa09396

specific_config has 4 bytes of size and then an amount of bytes specified
by size. All of the terminators that I've seen had a size equal to 4, but
theoretically it can vary.

Link: https://github.com/acpica/acpica/commit/23a659e1


Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>