kernel: Sync ACPICA with Intel's version
20140424.
Some highlights:
* Implemented support to skip/ignore NULL address entries in the
RSDT/XSDT.
* Removed an extraneous error message for the case where there
are a large number of system GPEs (> 124).
* Implemented and deployed additional configuration support for
the public ACPICA external interfaces.
* iASL and disassembler: Add full support for the LPIT table
(Low Power Idle Table).
* AcpiDump utility:
1) Add option to force the use of the RSDT (over the XSDT).
2) Improve validation of the RSDP signature (use 8 chars
instead of 4).
* Debugger: Updated the GPE command (which simulates a GPE by
executing the GPE code paths in ACPICA).
* Unix application OSL: Update line-editing support.
For a more detailed list, see sys/contrib/dev/acpica/changes.txt.