layerscape: fix pfe module autoload issue

There was a typo in module.mk for pfe module autoload.
This patch is to fix this and remove useless rc.local
which was for loading pfe module.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

target/linux/layerscape/base-files/etc/rc.local

@@ -1,4 +0,0 @@
-# Put your custom commands here that should be executed once
-# the system init finished. By default this file does nothing.
-modprobe pfe.ko
-exit 0