pcmcia: make pccard_cis_attr const

Make this const as it is only passed to the const arguments of the
functions sysfs_remove_bin_file and sysfs_create_bin_file. Make the
declaration const too.

Structure found using Coccinelle and changes done by hand.

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