ssl: Move SSL class to cpp file

This isn't required to be visible to anything outside of the main source
file, and will eliminate needing to rebuild anything else including the
header if the SSL class needs to be changed in the future.

src/core/hle/service/ssl/ssl.h

@@ -4,20 +4,12 @@
 
 #pragma once
 
-#include "core/hle/service/service.h"
+namespace Service::SM {
+class ServiceManager;
+}
 
 namespace Service::SSL {
 
-class SSL final : public ServiceFramework<SSL> {
-public:
-    explicit SSL();
-    ~SSL() = default;
-
-private:
-    void CreateContext(Kernel::HLERequestContext& ctx);
-    void SetInterfaceVersion(Kernel::HLERequestContext& ctx);
-};
-
 /// Registers all SSL services with the specified service manager.
 void InstallInterfaces(SM::ServiceManager& service_manager);