to spin up.

	* grub-core/disk/ata.c (grub_atapi_identify): Use GRUB_ATA_TOUT_DEV_INIT
	if dev->present is 1. Reset dev->present on failure.
	(grub_ata_device_initialize): Set dev->present to 1.
	* include/grub/ata.h (GRUB_ATA_TOUT_DEV_INIT): New value.
	(grub_ata_device): New member 'present'.