This patch fixes the issues found in..
	<1> notify_ducati.c: we were not unmapping
		"driver_obj->ctrl_ptr". This is done using
		unmap_ducati_virt_mem() implemented now in
		ducatienabler.
	<2> ducatienabler.c: implemented unmap_ducati_virt_mem()
		to iounmap() the "shm_virt_addr" we get calling
		ioremap() in get_ducati_virt_mem().
	<3> ducatienabler.h: added unmap_ducati_virt_mem().
	<4> notify_ducatidriver.h: added unmap_ducati_virt_mem().
Signed-off-by: Jayan John <x00jayan@ti.com>