[keymgr_dpe, dv] Remove backdoor load and generate randomness locally
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@rroth-lowrisc is already working on this.
Since Jul 15, 2026.
Component:DV
IP:keymgr_dpe
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Description
### Description
In this PR #30617 an options is introduce which allows us to load a _DPE Context_ key directly from the `keymgr_dpe` via backdoor.
It is necessary because the `keymgr_dpe` preload randomness into the _DPE slot_ before the _UDS_ is xored ontop of it during the initial load (necessary as countermeasure against SCA). Currently the `keymgr_dpe scoreboard` is not capable to generate this randomness thus the need for the backdoor.
However this solution should be replaced. The proposal is to replicate the randomness locally in the dv.
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