mux: make device_type const

Make this const as it is only stored in the type field of a device
structure, which is const.
Done using Coccinelle.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mux/core.c

@@ -58,7 +58,7 @@ static void mux_chip_release(struct device *dev)
 	kfree(mux_chip);
 }
 
-static struct device_type mux_type = {
+static const struct device_type mux_type = {
 	.name = "mux-chip",
 	.release = mux_chip_release,
 };