[POWERPC] Make iSeries spin on __secondary_hold_spinloop, like pSeries

Currently all iSeries secondary CPUs spin directly on the cpu_start
field in their paca.  Make them spin on the global
__secondary_hold_spinloop until after the pacas have been initialised.

As Stephen Rothwell points out, this works at the moment because
__secondary_hold_spinloop is being set already, but iSeries isn't
looking at it :)

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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