[PATCH] powerpc: give iSeries device tree nodes better names

Use the PCI class code to choose a name for the PCI device nodes and
to guess a device_type.  Failing that, base the name on the vendor and
device ids as specified in the spec.

Mark just about everything __init{data}.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>