s6gmac: Move the s6gmac drivers

Move the s6gmac driver to drivers/net/ethernet/ and
make the necessary Kconfig and Makefile changes.

CC: Oskar Schirmer <os@emlix.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 6cf7f99..4491d84 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -34,6 +34,7 @@
 obj-$(CONFIG_NET_VENDOR_QLOGIC) += qlogic/
 obj-$(CONFIG_NET_VENDOR_RACAL) += racal/
 obj-$(CONFIG_NET_VENDOR_REALTEK) += realtek/
+obj-$(CONFIG_S6GMAC) += s6gmac.o
 obj-$(CONFIG_NET_VENDOR_SEEQ) += seeq/
 obj-$(CONFIG_NET_VENDOR_SIS) += sis/
 obj-$(CONFIG_SFC) += sfc/