sfc: Move the Solarflare drivers

Moves the Solarflare drivers into drivers/net/ethernet/sfc/ and
make the necessary Kconfig and Makefile changes.

CC: Steve Hodgson <shodgson@solarflare.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1cb72da..5a4c875 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5754,7 +5754,7 @@
 M:	Ben Hutchings <bhutchings@solarflare.com>
 L:	netdev@vger.kernel.org
 S:	Supported
-F:	drivers/net/sfc/
+F:	drivers/net/ethernet/sfc/
 
 SGI GRU DRIVER
 M:	Jack Steiner <steiner@sgi.com>