ata: libata-core: Check device support before querying power state

The standby path queries the power state before checking whether the
device accepts ATA power-management commands. This sends CHECK POWER MODE
to ATAPI devices, including the QEMU DVD-ROM, which rejects it.

Run the existing taskfile initialization and device-class check first,
as the active-power path already does.

Fixes: 9cec467d0502 ("ata: libata-core: Do not call ata_dev_power_set_standby() twice")
Signed-off-by: Giuseppe Piscitelli <ooonea@gmail.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://lore.kernel.org/r/20261026202513.669084-1-ooonea@gmail.com
Signed-off-by: Niklas Cassel <cassel@kernel.org>

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