ata: sata_mv: Do not over-write initialise fields in 'mv6_sht'

ata: sata_mv: Do not over-write initialise fields in 'mv6_sht'

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

 drivers/ata/sata_mv.c:670:16: warning: initialized field overwritten [-Woverride-init]
 drivers/ata/sata_mv.c:670:16: note: (near initialization for ‘mv6_sht.can_queue’)

Cc: Jens Axboe <axboe@kernel.dk>
Cc: Mark Lord <mlord@pobox.com>
Cc: ALWAYS copy <linux-ide@vger.kernel.org>
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210528090502.1799866-5-lee.jones@linaro.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>