Fix typo. unknwon -> unknown

Switch to intr_establish_xname().

Use __builtin_clz instead of our own cntlzw

Use <sys/foo.h> instead of <machine/foo.h> if such a file exists.
Don't assume <sys/cpu.h> includes <powerpc/subarch/cpu*.h>. Include it
explicitly.

Support PowerPC 405EX/EXr.
1. Add some new source and header files.
(MAL(split) and RGMII(new) relations for EMAC)
2. Create dcr4xx.h. Its moved from dcr405gp.h. Also remove dcr405xx.h.

Support PowerPC 405EX/EXr.
1. Add some new source and header files.
(MAL(split) and RGMII(new) relations for EMAC)
2. Create dcr4xx.h. Its moved from dcr405gp.h. Also remove dcr405xx.h.
3. intr.c supports MULTIUIC with virtual-irq. likes to oea.
support 32-virq/128-hwirq.
4. multiple emac support.
5. WALNUT and VIRTEX_* includes arch/powerpc/conf/files.ibm4xx.
6. WALNUT pci uses arch/powerpc/ibm4xx/pci/.

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