Revert "net: Microchip encx24j600 driver"

This reverts commit 04fbfce7a2.

drivers/net/ethernet/microchip/Kconfig

@@ -33,13 +33,4 @@ config ENC28J60_WRITEVERIFY
 	  Enable the verify after the buffer write useful for debugging purpose.
 	  If unsure, say N.
 
-config ENCX24J600
-    tristate "ENCX24J600 support"
-    depends on SPI
-    ---help---
-      Support for the Microchip ENC424J600 ethernet chip.
-
-      To compile this driver as a module, choose M here. The module will be
-      called enc424j600.
-
 endif # NET_VENDOR_MICROCHIP