MIPS: PCI: use information from 1-wire PROM for IOC3 detection

IOC3 chips in SGI system are conntected to a bridge ASIC, which has
a 1-wire prom attached with part number information. This changeset
uses this information to create PCI subsystem information, which
the MFD driver uses for further platform device setup.

Signed-off-by: Thomas Bogendoerfer <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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