printk: Constify name for add_preferred_console()

While adding a preferred console handling for serial_core for serial port
hardware based device addressing, Jiri suggested we constify name for
add_preferred_console(). The name gets copied anyways. This allows serial
core to add a preferred console using serial drv->dev_name without copying
it.

Note that constifying options causes changes all over the place because of
struct console for match().

Suggested-by: Jiri Slaby <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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