Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Import ACPICA 20090521.

Clean up DSDT and XSDT correctly instead of FADT when the tables are bad.

Submitted by: jhb
Tested by: olli
MFC after: 3 days

Catch up with ACPI-CA 20070320 import.

Canonize the include of acpi.h.

Standardize __FBSDID identifiers.

MFC after: 2 days

Add the table quirk matching code. It matches rules defined in acpi_quirks
and sets the flags. It also calls the machdep quirk code first. This
allows table quirks (or whitelists) to override machdep quirks.