ata: pata_amd: Fix incorrectly named function in the header

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

 drivers/ata/pata_amd.c:331: warning: expecting prototype for nv_probe_init(). Prototype was for nv_pre_reset() instead

Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-ide@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>