MFC r285914, r289029, r289030 and r289560:

MFC r285914, r289029, r289030 and r289560:
- Move the remainder of host controller capability registers reading from
  xhci_start_controller() to xhci_init(). These values don't change at run-
  time so there's no point of acquiring them on every USB_HW_POWER_RESUME
  instead of only once during initialization. In r276717, reading the first
  couple of registers in question already had been moved as a prerequisite
  for the changes in that revision.
- Identify ASMedia ASM1042A controllers.
- Use NULL instead of 0 for pointers.
- Add quirks for USB 3.0 PCI devices.

PR:		203650

git-svn-id: svn://svn.freebsd.org/base/stable/9@290333 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f