C-state FFH on x41

[Mark Kettenis]

I have an x41 that prints the following in dmesg:

acpicpu0 at acpi0
C1: unknown FFH vendor 8: !C3(250@85 io@0x1015), C2(500@1 io@0x1014), PSS

The relevant AML indead has that strange value in the "Bit Width" field:

           Name (CST1, Package (0x02)
            {
                0x01, 
                Package (0x04)
                {
                    ResourceTemplate ()
                    {
                        Register (FFixedHW, 
                            0x08,               // Bit Width
                            0x00,               // Bit Offset
                            0x0000000000000000, // Address
                            ,)
                    }, 

                    0x01, 
                    0x01, 
                    0x03E8
                }
            })

Obviously this ACPI BIOS is buggy and perhaps we should indeed
complain.  But we also should include a C1 HALT state in the list
regardless, and I don't think we currently do that.