[PATCH 2.6.12] PPC32: Add rtc hooks to katana + fw bug workaround

Add rtc hooks to katana and workaround firmware bug.

- Now that the mv64xxx i2c and m41t00 i2c rtc drivers are in the source base, add hooks to the katana file to use that rtc.
- A recent version of the katana firmware incorrectly changes the mv64x60's pci vendor & device id so this patch puts back the proper values.
- Misc. cleanup and update of the default config file.

Please apply.

Signed-off-by: Mark A. Greer <redacted>