[rram_ctrl] remove unused ports of AST
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@meisnere is already working on this.
Since Aug 12, 2026.
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Description
With the removal of `otp_macro` and `flash_ctrl` the following ports from `ast.sv` become obsolete:
```sv
.flash_power_down_h_o ( ),
.flash_power_ready_h_o ( ),
.otp_power_seq_i ( '0 ),
.otp_power_seq_h_o ( ),
.fla_obs_i ( '0 ),
.otp_obs_i ( '0 ),
```
there might be a new one coming:
`rram_obs_i` but it is not yet known how wide this will be and if it is indeed required.
see comments here:
https://github.com/lowRISC/opentitan/pull/30924
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