common/log: Move Log namespace into the Common namespace

Forgot to move this over when I moved the rest of the source files with
lacking namespaces over.

src/core/hle/kernel/svc.cpp

@@ -529,7 +529,7 @@ ResultCode SVC::ControlMemory(u32* out_addr, u32 addr0, u32 addr1, u32 size, u32
         return ERR_INVALID_COMBINATION;
     }
 
-    process.vm_manager.LogLayout(Log::Level::Trace);
+    process.vm_manager.LogLayout(Common::Log::Level::Trace);
 
     return RESULT_SUCCESS;
 }