#22 8260 uart - fixed SCC support + console + kgdb + ext ser clk

[Murray Jensen]

Changed files:

arch/ppc/8260_io/uart.c
arch/ppc/8260_io/commproc.c
include/asm-ppc/cpm_8260.h
include/asm-ppc/immap_8260.h

- added support for SCC1
- added support for console on SCC
- added kgdb support
- added support for using external serial clock on SCC (new m8260_cpm_extcbrg() function)
- made immr and cpmp variables volatile

[Murray Jensen]

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