PowerPC e200 duplicate register definitions

Host environment

Operating system: Win10
Architecture: PowerPC
QEMU flavor: qemu-system-ppc
QEMU version: 9.2.0
QEMU command line:
```
qemu-system-ppc -cpu e200z5
```

Description of problem

Registers DSRR0 and DSRR1 defined twice in the target/ppc/cpu_init.c:

in the common register_BookE_sprs()
and specific init_proc_e200()

The second case should be removed.

Steps to reproduce

run qemu-system-ppc -cpu e200z5
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))

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