Unnecessary automatic transformation

Running chiptool with:
```
chiptool generate --svd svdfile.svd
```
results with:
```
thread 'main' panicked at src/transform/mod.rs:104:60:
called `Result::unwrap()` on an `Err` value:
Err: on rename Fieldset "EMIOS_1::regs::C2_0", new name "emios_1::regs::C20" already exist
....
```
is there anyway to disable this automatic transformation? since both C20 and C2_0 exists on HW, after transformation name conflict rises.