[LinuxBIOS] about the put sb chain on bus 0 and let sb ht end device use unitid 1

[Lu, Yinghai]

I added some code to make 
1. sb ht chain sit on bus 0
2. let HT chain end device use small unit id..

So We can make the bus num and device num to be same to system BIOS. It
maybe useful to let use compare mptable/irqtable/acpi tables....

I will produce one patch after you apply issue36 and issue 37 to the
public tree.

YH