net: fill in MODULE_DESCRIPTION()s for plip

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to the PLIP (parallel port) network module

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20240214152741.670178-4-leitao@debian.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>