net: fill in MODULE_DESCRIPTION()s in kuba@'s modules

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Fill it in for the modules I maintain.

Acked-by: Kalle Valo <kvalo@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>