kernel-arch.bbclass: Add powerpc64 mappings
kernel-arch.bbclass: Add powerpc64 mappings

A future TODO is to see if there's anything left that must
build with ARCH=ppc in the kernel that can't be upgraded to a
newer kernel with ARCH=powerpc.

Signed-off-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

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