parisc: Move find_pa_parent_type() out of init section

The 0-DAY kernel test infrastructure reported that inet_put_port() may
reference the find_pa_parent_type() function, so it can't be moved into the
init section.

Fixes: b86db40e ("parisc: Move various functions and strings to init section")
Signed-off-by: Helge Deller <deller@gmx.de>