tty: mips_ejtag_fdc: constify mips_cdmm_device_id

mips_cdmm_device_id are not supposed to change at runtime.
mips_cdmm_driver is working with const 'id_table'. So mark
the non-const mips_cdmm_device_id structs as const.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/mips_ejtag_fdc.c

@@ -1110,7 +1110,7 @@ static int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev)
 	return ret;
 }
 
-static struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
+static const struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
 	{ .type = 0xfd },
 	{ }
 };