tty/vt: consolemap: use E_TABSZ for the translations size

The code expects "translations" to have 256 (E_TABSZ) values. Use the
macro instead of the constant to be explicit about this.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220614090537.15557-8-jslaby@suse.cz


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