[keymgr_dpe, sw] Use `sec_mmio_write32` in silicon_creator driver
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@rroth-lowrisc is already working on this.
Since Jul 6, 2026.
IP:keymgr_dpe
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Description
### Description
During the initial development of the `keymgr_dpe` silicon creator driver several `sec_mmio_write32` were omitted in favor of `abs_mmio_write32` when writing into hardware modified registers (like **REGWEN** registers). This needs to be fixed.
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