tty/vt: consolemap: use ARRAY_SIZE()

The code uses constants as bounds in loops. Use ARRAY_SIZE() with
appropriate parameters instead. This makes the loop bounds obvious.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220607104946.18710-1-jslaby@suse.cz


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>