Disassembler: Add EINJ "Flush Cacheline" instruction.

This instruction was added post-ACPI 5.0
Colin Ian King <colin.king@canonical.com>
AcpiDump/FreeBSD: Fix for memory leak and an AE_ exception.

1) Make sure to unmap table in an error case.
2) Return AE_LIMIT when there exists an instance.  Otherwise, return AE_NOT_FOUND.

Jung-uk Kim <jkim@FreeBSD.org>