Install pfe module to target directory

Due to a bug, pfe.ko was not copied over to the target directory.

Change-Id: I2b59ca35d7624bb9b83819ecf515695676f17f34
diff --git a/Makefile b/Makefile
index 16b3c95..95541b8 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@
 	$(MAKE) -C $(@D) $(LINUX_MAKE_FLAGS) KERNELDIR=$(LINUX_DIR) PFE_DIR=../pfe
 
 pfe_ctrl/install:
-	$(MAKE) -C $(LINUX_DIR) $(LINUX_MAKE_FLAGS) M="$(@D)/pfe_ctrl" modules_install
+	$(MAKE) -C $(LINUX_DIR) $(LINUX_MAKE_FLAGS) M=$(PWD)/$(@D) modules_install
 
 %/all:
 	$(MAKE) -C $* all