For moving machine header files to
arch/blackfin/include/asm/mach-bf{527, 533, 537, 538, 548, 561}, we
need to set a link such as arch/blackfin/include/asm/mach ->
arch/blackfin/include/asm/mach-bf527, because tons of drivers use the
header file <asm/mach/xxxx.h>.
But we don't like to setup a link that is the one reason we move our
header file from include/asm-blackfin to our arch/blackfin/include/asm.
-Bryan
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