[otbn,rtl] Cache recoverable error flag during a run
[otbn,rtl] Cache recoverable error flag during a run

This won't make any difference when secure wipe is disabled, because
the recoverable error signal gets pulsed at the same time as
done_core. But it's needed if secure wipe is enabled (when done_core
will be signalled some time after the recoverable error is seen).

Signed-off-by: Rupert Swarbrick <290093e2ad2515ed2f14d749293c8cf8e02ca274@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan