powerpc: Define 32/64 bit asm macros and use them in fpu.S
These macros help in writing assembly code that works for both ppc32
and ppc64. With this we now have a common fpu.S. This takes out
load_up_fpu from head_64.S.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
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