pch_gbe: Move the OKI Semiconductor driver

Move the OKI Semiconductor driver into driver/net/ethernet/oki-semi/
and make the necessary Kconfig and Makefile changes.

Note: there is no documented maintainer for this driver, so I CC'd
the last 2 major contributors.

CC: Tomoya <tomoya-linux@dsn.okisemi.com>
CC: Toshiharu Okada <toshiharu-linux@dsn.okisemi.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index ea0999f..b5ca872 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -23,6 +23,7 @@
 obj-$(CONFIG_NET_VENDOR_MELLANOX) += mellanox/
 obj-$(CONFIG_NET_VENDOR_MYRI) += myricom/
 obj-$(CONFIG_NET_VENDOR_NATSEMI) += natsemi/
+obj-$(CONFIG_NET_VENDOR_OKI) += oki-semi/
 obj-$(CONFIG_NET_VENDOR_PASEMI) += pasemi/
 obj-$(CONFIG_NET_VENDOR_QLOGIC) += qlogic/
 obj-$(CONFIG_NET_VENDOR_RACAL) += racal/