serial: pic32: remove pic32_get_port() macro

It's just &sport->port. First, sport was not in parenthesis, so macro
expansion could be an issue. Second, it's so simple, that we can expand
the macro and make the code really straightforward.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220503063122.20957-7-jslaby@suse.cz


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