[PATCH] libata: Move ata_probe_ent_alloc to libata_core

Move ata_probe_ent_alloc to libata-core. It will also be used by
future SAS/SATA integration patches.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>