ACPICA: ACPI 4: Update headers for new and changed ACPI tables.

Add IVRS,MSCT,UEFI,WAET,WDAT.
Updated several existing tables for ACPI 4.0-related changes.
Added document references for all tables not defined in ACPI spec.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>