powerpc: Make load_up_fpu and load_up_altivec callable

Make load_up_fpu and load_up_altivec callable so they can be reused by
the VSX code.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --cc arch/powerpc/kernel/fpu.S
Simple merge

diff --cc arch/powerpc/kernel/head_32.S
Simple merge

diff --cc arch/powerpc/kernel/head_64.S
Simple merge

diff --cc arch/powerpc/kernel/head_booke.h
Simple merge