Add modinfo attribute to ps3_system_bus devices.  Also make them all
children of the same ps3_system_bus 'device' so they appear in a
corresponding subdirectory under /sys/devices.
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
Signed-off-by: NGeoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>