* FTSEurofirst 300, Euro STOXX 50 rise * Spain gets boost from Moody's * German business morale rises in February, Ifo says * Volkswagen, HSBC cap gains By Joshua Franklin LONDON, Feb 24 (Reuters) - Demand for Spanish equities helped European shares to extend their rally on Monday to six-year highs, but worse-than-expected results from HSBC and a disappointing outlook from Volkswagen capped the gains. Spanish stocks rose 0.9 percent after Moody's raised Spain's soverei