com20020_cs: Move the PCMCIA Arcnet driver

Move the COM20020 PCMICA Arcnet driver into drivers/net/arcnet/ with
the other Arcnet drivers.  Made the necessary Kconfig and Makefile
changes as well.

Since this was the "last" PCMCIA driver in drivers/net/pcmcia/, this patch
also cleans up the references to drivers/net/pcmcia.

CC: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/Makefile

@@ -51,7 +51,6 @@ obj-$(CONFIG_SLHC) += slip/
 obj-$(CONFIG_TR) += tokenring/
 obj-$(CONFIG_WAN) += wan/
 obj-$(CONFIG_ARCNET) += arcnet/
-obj-$(CONFIG_NET_PCMCIA) += pcmcia/
 
 obj-$(CONFIG_USB_CATC)          += usb/
 obj-$(CONFIG_USB_KAWETH)        += usb/