* disk/ata.c (GRUB_ATAPI_REG_*): New defines.
(GRUB_ATAPI_IREASON_*): Likewise.
(grub_ata_pio_write): Fix timeout error return.
(grub_atapi_identify): Add grub_ata_wait () after cmd.
(grub_atapi_wait_drq): New function.
(grub_atapi_packet): New parameter `size'.
Use grub_atapi_wait_drq () and direct write instead of
grub_ata_pio_write ().
(grub_atapi_read): Replace grub_ata_pio_read () by a loop which
reads the number of bytes requested by the device for each DRQ
assertion.
(grub_atapi_write): Remove old implementation, return not
implemented instead.
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