ata: Trivial spelling fixes in the file pata_ns87415.c

Trivial spelling fixes.

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210312085738.9372-1-unixbhaskar@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>