[PATCH] libata: remove unused functions

There is no user of ata_qc_wait_err() and ata_qc_complete_noop() after
ata_exec_internal() changes.  Remove unused functions.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>