[racl_ctrl,rtl] Strangely named recoverable alert

### Description

The recoverable alert from `racl_ctrl` is called `recov_ctrl_update_err`. I'm not sure what a "recov_ctrl" is or whether this is a recoverable "ctrl" error but both seem a bit odd.

There's no need to add the block name as a prefix, so I'd suggest just "update_err".

Start by locating the recoverable alert declaration in the racl_ctrl block and check where recov_ctrl_update_err is referenced. Rename it to update_err, update all references, and verify that the racl_ctrl checks pass with no old-name references remaining.

Written by the indexing model from the issue text.