Fixes a redefinition warning on Ubuntu 25.10 coming from `ptrace.h`
including `hwcap.h`.
```
/home/jonas/llvm/llvm-project/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp:84:9: warning: ‘HWCAP2_POE’ redefined
84 | #define HWCAP2_POE (1ULL << 63)
| ^~~~~~~~~~
In file included from /usr/include/aarch64-linux-gnu/asm/ptrace.h:25,
from /home/jonas/llvm/llvm-project/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h:19,
from /home/jonas/llvm/llvm-project/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp:11:
/usr/include/aarch64-linux-gnu/asm/hwcap.h:141:9: note: this is the location of the previous definition
141 | #define kkk (1UL << 63)
| ^~~~~~~~~~
```
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