toshiba_acpi: rename add_device() and remove_device() to create_toshiba_proc_entries() and remove_toshiba_proc_entries()

To improve readability rename add_device() to
create_toshiba_proc_entries() and rename remove_device() to
remove_toshiba_proc_entries().
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Márton Németh <nm127@freemail.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>