Fix ACPI DSDT indentation cosmetic breakage introduced in r264631 --
pointed out by jhb@.

Approved by:	grehan (co-mentor)
Add support for the PIT 'readback' command -- based on a patch by grehan@.

Approved by:	grehan (co-mentor)
Add new USB quirk.

Submitted by:	kwm @
MFC after:	1 week