parport: make parport_ip32_ops const and __initconst

Make this const as it is only used during a copy operation. This usage
is inside init function and the structure is not referenced after
initialisation, so make it __initconst too.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>