dm: net: Move IXP NPE to drivers/net/

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Bryan Hundven <bryanhundven@gmail.com>
Cc: Michael Schwingen <rincewind@discworld.dascon.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: U-Boot DM <u-boot-dm@lists.denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/Makefile b/Makefile
index e3a27c6..6718f8d 100644
--- a/Makefile
+++ b/Makefile
@@ -238,7 +238,7 @@
 LIBS-y += $(CPUDIR)/$(SOC)/lib$(SOC).o
 endif
 ifeq ($(CPU),ixp)
-LIBS-y += arch/arm/cpu/ixp/npe/libnpe.o
+LIBS-y += drivers/net/npe/libnpe.o
 endif
 LIBS-$(CONFIG_OF_EMBED) += dts/libdts.o
 LIBS-y += arch/$(ARCH)/lib/lib$(ARCH).o