install: don't install our own hotplug-script.

There can only be one /sbin/hotplug, and it's not mindspeed specific.  Let's
put that in buildroot/fs/skeleton instead.

Change-Id: I4899faf7645c836f8b2a080acbb32541da8ada47
diff --git a/Makefile b/Makefile
index fde0a8d..a45ac7c 100644
--- a/Makefile
+++ b/Makefile
@@ -11,10 +11,6 @@
 clean:   $(addsuffix /clean,$(DIRS))
 install: $(addsuffix /install,$(DIRS))
 
-install:
-	$(INSTALL) -m 0755 -D $(@D)/hotplug-script \
-		$(TARGET_DIR)/sbin/hotplug
-
 pfe_ctrl/all:
 	$(MAKE) -C pfe_ctrl $(LINUX_MAKE_FLAGS) KERNELDIR=$(LINUX_DIR) PFE_DIR=../pfe WIFI_ENABLE=y