Add a more sane socket registration interface.

Previously, it was messed up because Greg's struct class hadn't been
invented when I wrote the code: there may be multiple sockets per
"struct device", and there is the need for one "struct class_device"
for each socket.

 drivers/pcmcia/cs.c         |  217 +++++++++++++++++++++----------------------- drivers/pcmcia/ds.c         |   56 ++---------
 drivers/pcmcia/i82092.c     |   48 ++++-----
 drivers/pcmcia/i82365.c     |   41 ++++----
 drivers/pcmcia/pci_socket.c |   23 +---
 drivers/pcmcia/pci_socket.h |    2
 drivers/pcmcia/tcic.c       |   38 ++++---
 include/pcmcia/ss.h         |   25 +++--
 8 files changed, 210 insertions(+), 240 deletions(-)