• 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.

MFC after: 3 days