Add more KL grovelling routines: one routine to enumerate on all nodes,

and routines to turn a KL console and a KL component structs, respectively,
into struct sgi_device_location for further device identification.

XXX Due to the way PCI devices are numbered on PIC buses, this code is tainted
XXX by knowledge about PIC widgets, to compensate. I have considered changing
XXX xbridge(4) to have our PCI device numbering match KL on PIC-connected
XXX devices, but I expect this to be even uglier. This is not settled yet.

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