greybus: Makefile: provide install target

Provide an install Makefile target for those that want to install the
kernel modules.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

--
v3: resend to list, somehow this thread got taken private and v2 never
    made it there.

v2: add -a option to depmod, thanks to Mitchell

drivers/staging/greybus/Makefile

@@ -46,3 +46,7 @@ clean:
 coccicheck:
 	$(MAKE) -C $(KERNELDIR) M=$(PWD) coccicheck
 
+install: module
+	mkdir -p /lib/modules/$(KERNELVER)/kernel/drivers/greybus/
+	cp -f *.ko /lib/modules/$(KERNELVER)/kernel/drivers/greybus/
+	depmod -a $(KERNELVER)