The attribute for if_le_oioc.c should apparently be le24, not le,
so that this file is not pulled into the GENERIC32_IP3x kernel,
where am7990.c isn't built.

Enable Personal IRIS 4D/20 and 4D/25 support:
- Adapt int(4) to handle the INT1 chip
- Move generic rtc clocks out of hpc/ and into dev/
- Handle the very strangely wired eeprom and other bits

Enable Personal IRIS 4D/20 and 4D/25 support:
- Adapt int(4) to handle the INT1 chip
- Move generic rtc clocks out of hpc/ and into dev/
- Handle the very strangely wired eeprom and other bits in arcemu
- Sprinkle MACH_SGI_IP6 as necessary
- Enable IP6/IP10 devices in GENERIC32_IP12. Yes, the naming is poor but
there's no winning with kernel/hw compatibility on sgimips...

Tested on my 4D/25. Doesn't (appear to) break macallan@'s IP22.

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merge ktrace-lwp.

Add dedicated IOC (I/O Controller) driver. pckbc, zstty, and lpt will each
receive *_ioc.c attachments; machines without IOC (i.e., IP20) will use *_hpc.c
stubs.