These changes incorporate steve goodrich'es fixes, and one bug that is
cs5536: add new entires for SB control etc.
cs5536.c: chip_enabled function moved to chip_init, so it only gets run
IRQ setup improved
gx2def.h: new defines added
vr.h: new file, with new def's for virtual register control.
mainboard config.lb: new entries added for nb and sb control.
chipsetinit.c: new controls added -- I forget all the details :-)
grphinit.c: new function added
northbridge.c: new IRQ control added. FlashChipSetup added, controlled
by chip info setupflash struct member. Currently, if enabled, this hangs
OLPC in linux PCI scan.
chip.h: new struct members added for unwanted device enable, flash setup