[POWERPC] PS3: Make bus_id and dev_id u64

Change the PS3 bus_id and dev_id from type unsigned int to u64.  These
IDs are 64-bit in the repository, and the special storage notification
device has a device ID of ULONG_MAX.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>