AP_DAL: Standalone: add int8 parameter set_and_default method to avoid include

libraries/AP_DAL/examples/AP_DAL_Standalone/main.cpp

@@ -9,6 +9,11 @@
 
 void AP_Param::setup_object_defaults(void const*, AP_Param::GroupInfo const*) {}
 
+template<typename T, ap_var_type PT>
+void AP_ParamT<T, PT>::set_and_default(const T &v) {}
+template class AP_ParamT<int8_t, AP_PARAM_INT8>;
+
+
 int AP_HAL::Util::vsnprintf(char*, size_t, char const*, va_list) { return -1; }
 
 void *nologger = nullptr;