m68k/q40: Make NE2000 builtin instead of modular

All other Ethernet drivers are builtin, for NFS root.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/configs/q40_defconfig

@@ -340,7 +340,7 @@ CONFIG_VETH=m
 # CONFIG_NET_VENDOR_INTEL is not set
 # CONFIG_NET_VENDOR_MARVELL is not set
 # CONFIG_NET_VENDOR_MICREL is not set
-CONFIG_NE2000=m
+CONFIG_NE2000=y
 # CONFIG_NET_VENDOR_QUALCOMM is not set
 # CONFIG_NET_VENDOR_ROCKER is not set
 # CONFIG_NET_VENDOR_SAMSUNG is not set