ata: pata_macio: Avoid overwriting initialised field in 'pata_macio_sht'

Fixes the following W=1 kernel build warning(s):

 drivers/ata/pata_macio.c:925:21: warning: initialized field overwritten [-Woverride-init]
 drivers/ata/pata_macio.c:925:21: note: (near initialization for ‘pata_macio_sht.slave_configure’)

Cc: Jens Axboe <axboe@kernel.dk>
Cc: benh@kernel.crashing.org
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210528090502.1799866-12-lee.jones@linaro.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>