* TSX up 28.51 points, or 0.24 percent, at 11,970.21 * Banks, miners and energy companies all help with rise By Alastair Sharp TORONTO, Sept 5 (Reuters) - Canadian stocks were broadly higher on Wednesday, helped by investors seeing the positive in recent bank earnings and strong gains among energy companies after a week of weakness. By 10:35 a.m (1435 GMT) the Toronto Stock Exchange's S&P/TSX composite index had gained 28.51 points, or 0.24 percent, at 11,970.21. The gains r