[rv_core_ibex/lint] Update waiver for ascent lint
[rv_core_ibex/lint] Update waiver for ascent lint

Signal name has changed.

Signed-off-by: Tom Roberts <f3b1a53ee1cbeb35a47033dea932030093853292@lowrisc.org>

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