linuxppc_2_4_devel patch to add KGDB support to gt64260 MPSC

[Mark A. Greer]

Patch that:

- Removes polled putc routine from arch/ppc/kernel/gt64260_common.c
- Creates arch/ppc/kernel/gt64260_dbg.c file that contains progress
routine and kgdb interface routine for gt64260 MPSC.
- Does some compiler warning cleanups on arch/ppc/kernel/gt64260_pic.c

Mark
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