[kmac, rtl/dv/sw] Align error codes

Nobody has claimed this yet.

After removing the `ErrShadowRegUpdate` error (see #25035) only the error code was removed but the error codes of the other errors were not reordered. The reason for this is to ensure that SW still is compatible with the hardware state from the `earlgrey_1.0.0` branch.

However, in the future, we also should reorder the following error codes in `kmac_pkg.sv`:
```
ErrFatalError from 8'h C1 to 8'h C0
ErrPackerIntegrity from 8'h C2 to 8'h C1
ErrMsgFifoIntegrity from 8'h C3 to 8'h C2
```

and in `dif_kmac.h`:
```
kDifErrorFatalError from 0xC1 to 0xC0
kDifErrorPackerIntegrity from 0xC2 to 0xC1
kDifErrorMsgFifoIntegrity from 0xC3 to 0xC2

```

Start with kmac_pkg.sv and dif_kmac.h, where the three KMAC error-code values are listed. Check the existing values and the earlgrey_1.0.0 compatibility context before making the alignment; done means the RTL and software constants use the requested reordered codes consistently.

Written by the indexing model from the issue text.