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Add arch-specific makefiles and configs needed to build for
ppc64. Also add a minimal head.S that is a simple infinite loop.
head.o can be built with

$ make XEN_TARGET_ARCH=ppc64 KBUILD_DEFCONFIG=tiny64_defconfig arch/powerpc/ppc64/head.o
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>