Implement am ICommonStateGetter::SetCpuBoostMode (#743)

- Implement am ICommonStateGetter::SetCpuBoostMode according to the RE:

```
signed __int64 __fastcall nn::ICommonStateGetter::SetCpuBoostModeImpl(__int64 this, unsigned int cpu_boost_mode)
{
  if ( cpu_boost_mode > 1 )
  {
    return 0x3F480LL;
  }

  __int64 v2 = *(_QWORD *)(this + 0x38);
  __int64 v3 = *(_QWORD *)(*(_QWORD *)(v2 + 8) + 0x298LL);

  nnLock((_DWORD *)(v3 + 0x104));

  __int64 v5 = *(_QWORD *)(v2 + 0x18);
  bool unk_bool = *(unsigned __int8 *)(v5 + 0x7C);

  *(_DWORD *)(v5 + 0x80) = cpu_boost_mode;

  if (!unk_bool)
  {
    *(_BYTE *)(v5 + 0x7C) = 1;
  }

  wait_condvar(v3 + 0xA8);
  nnUnlock((_DWORD *)(v3 + 0x104));

  return 0LL;
}
```

- Add enum for apm CpuBoostMode
- Add missing values in apm PerformanceConfiguration with some comments.

1 files changed, 21 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Am/ICommonStateGetter.cs b/Ryujinx.HLE/HOS/Services/Am/ICommonStateGetter.cs
index 59474126..44421b30 100644
--- a/Ryujinx.HLE/HOS/Services/Am/ICommonStateGetter.cs
+++ b/Ryujinx.HLE/HOS/Services/Am/ICommonStateGetter.cs
@@ -10,6 +10,8 @@ namespace Ryujinx.HLE.HOS.Services.Am
     {
         private KEvent _displayResolutionChangeEvent;
 
+        private Apm.CpuBoostMode _cpuBoostMode = Apm.CpuBoostMode.Disabled;
+
         public ICommonStateGetter(Horizon system)
         {
             _displayResolutionChangeEvent = new KEvent(system);
@@ -116,5 +118,24 @@ namespace Ryujinx.HLE.HOS.Services.Am
 
             return ResultCode.Success;
         }
+
+        [Command(66)] // 6.0.0+
+        // SetCpuBoostMode(u32 cpu_boost_mode)
+        public ResultCode SetCpuBoostMode(ServiceCtx context)
+        {
+            uint cpuBoostMode = context.RequestData.ReadUInt32();
+
+            if (cpuBoostMode > 1)
+            {
+                return ResultCode.CpuBoostModeInvalid;
+            }
+
+            _cpuBoostMode = (Apm.CpuBoostMode)cpuBoostMode;
+
+            // NOTE: There is a condition variable after the assignment, probably waiting something with apm:sys service (SetCpuBoostMode call?).
+            //       Since we will probably never support CPU boost things, it's not needed to implement more.
+
+            return ResultCode.Success;
+        }
     }
 }
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