PowerPC e200 duplicate register definitions
Description of problem:
Registers DSRR0 and DSRR1 defined twice in the `target/ppc/cpu_init.c`:

- in the common [`register_BookE_sprs()`](https://gitlab.com/qemu-project/qemu/-/blob/master/target/ppc/cpu_init.c#L740-748)
- and specific [`init_proc_e200()`](https://gitlab.com/qemu-project/qemu/-/blob/master/target/ppc/cpu_init.c#L2735-2742)

The second case should be removed.
Steps to reproduce:
1. run  `qemu-system-ppc -cpu e200z5`
2. check output
```
**
ERROR:../qemu-9.2.0/target/ppc/helper_regs.c:410:_spr_register: assertion failed: (spr->name == ((void *)0))
Bail out! ERROR:../qemu-9.2.0/target/ppc/helper_regs.c:410:_spr_register: assertion failed: (spr->name == ((void *)0))
```