ide: unexport ide_acpi_set_state

This patch removes the unused EXPORT_SYMBOL_GPL(ide_acpi_set_state)

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>