[lldb][FreeBSD] Fix NativeRegisterContextFreeBSD_{arm,mips64,powerpc} declarations (#101403)

Similar to #97796, fix the type of the `native_thread` parameter for the
arm, mips64 and powerpc variants of `NativeRegisterContextFreeBSD_*`.

Otherwise, this leads to compile errors similar to:

```
lldb/source/Plugins/Process/FreeBSD/NativeRegisterContextFreeBSD_powerpc.cpp:85:39: error: out-of-line definition of 'NativeRegisterContextFreeBSD_powerpc' does not match any declaration in 'lldb_private::process_freebsd::NativeRegisterContextFreeBSD_powerpc'
   85 | NativeRegisterContextFreeBSD_powerpc::NativeRegisterContextFreeBSD_powerpc(
      |                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

(cherry picked from commit 7088a5e)

Author: DimitryAndric

lldb/source/Plugins/Process/FreeBSD/NativeRegisterContextFreeBSD_arm.h

@@ -30,7 +30,7 @@ class NativeProcessFreeBSD;
 class NativeRegisterContextFreeBSD_arm : public NativeRegisterContextFreeBSD {
 public:
   NativeRegisterContextFreeBSD_arm(const ArchSpec &target_arch,
-                                   NativeThreadProtocol &native_thread);
+                                   NativeThreadFreeBSD &native_thread);
 
   uint32_t GetRegisterSetCount() const override;
 

lldb/source/Plugins/Process/FreeBSD/NativeRegisterContextFreeBSD_mips64.h

@@ -31,7 +31,7 @@ class NativeRegisterContextFreeBSD_mips64
     : public NativeRegisterContextFreeBSD {
 public:
   NativeRegisterContextFreeBSD_mips64(const ArchSpec &target_arch,
-                                      NativeThreadProtocol &native_thread);
+                                      NativeThreadFreeBSD &native_thread);
 
   uint32_t GetRegisterSetCount() const override;
 

lldb/source/Plugins/Process/FreeBSD/NativeRegisterContextFreeBSD_powerpc.h

@@ -31,7 +31,7 @@ class NativeRegisterContextFreeBSD_powerpc
     : public NativeRegisterContextFreeBSD {
 public:
   NativeRegisterContextFreeBSD_powerpc(const ArchSpec &target_arch,
-                                       NativeThreadProtocol &native_thread);
+                                       NativeThreadFreeBSD &native_thread);
 
   uint32_t GetRegisterSetCount() const override;