[keymgr_dpe / rram] Fix `flash_ecc_error_..._fpga_cw340_rom_ext`
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@gautschimi is already working on this.
Since Aug 7, 2026.
IP:keymgr_dpe
IP:rram_ctrl
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Description
### Description
These tests break with the integration of the `keymgr_dpe` and the `rram` into `earlgrey`.
## Reason `keymgr_dpe`:
With `SECRET2` pre-locked in the OTP image, `keymgr_dpe_testutils.c:296-306` cannot provision the
creator seed flash page, so the HW seed read of that zero-filled page errors on every
boot and latches a sticky `FLASH_CTRL.FAULT_STATUS` bit. `flash_exc_handler` requires `FAULT_STATUS` to
read back exactly zero, so it stops absorbing real ECC faults and shuts down instead.
## Reason `rram`:
#30897
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