enc28j60: Move the Microchip driver

Move the Microchip driver into drivers/net/ethernet/microchip/ and
make the necessary Kconfig and Makefile changes.

CC: Claudio Lanconelli <lanconelli.claudio@eptar.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 32561c7..0cec25c 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -78,6 +78,7 @@
 source "drivers/net/ethernet/marvell/Kconfig"
 source "drivers/net/ethernet/mellanox/Kconfig"
 source "drivers/net/ethernet/micrel/Kconfig"
+source "drivers/net/ethernet/microchip/Kconfig"
 
 config MIPS_SIM_NET
 	tristate "MIPS simulator Network device"