netconsole: rename functions to better reflect their purpose

Rename netpoll_parse_options() to netconsole_parser_cmdline() and
netpoll_print_options() to netconsole_print_banner() to better
describe what these functions actually do within the netconsole
context.

Also fix minor code style issues including variable declaration
ordering and spacing.

These functions are specific to netconsole functionality rather
than general netpoll operations, so the new names better reflect
their actual purpose.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20250613-rework-v3-5-0752bf2e6912@debian.org


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