docs: ja_JP: howto: remove reference to removed submitting-drivers

The document submitting-drivers.rst was deleted. This removes the
corresponding reference in the Japanese translation of the howto,
with some assistance from Akira Yokasawa.

Link: https://lore.kernel.org/linux-doc/a2be48e5-e559-17d7-5ae7-d1205a737ea4@gmail.com/


Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Akira Yokosawa <akiyks@gmail.com>
Link: https://lore.kernel.org/r/20220704122537.3407-9-lukas.bulwahn@gmail.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>