Cherry-pick to earlgrey_1.0.0: [cryptotest] Fix some failing RSA verify cryptotests#28661

nasahlpa merged 2 commits intoearlgrey_1.0.0lowRISC/opentitan:earlgrey_1.0.0from

backport-28655-to-earlgrey_1.0.0lowRISC/opentitan:backport-28655-to-earlgrey_1.0.0Copy head branch name to clipboard