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[ot] hw/opentitan: ot_rom_ctrl: Remove S&P from data scrambling
In Earlgrey, the S&P layer has been removed from the data scrambling logic, which affects the scrambling of the generated ROM. The functionality is removed entirely from the ROM Control to improve error detection guarantees, interactions with ECC, and timing. This commit removes the now-redundant logic related to the S&P layer, instead directly unscrambling words by XORing the keystream and the `scr`/`in` data.
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