PHILADELPHIA—Maybe it’s no big deal. Andrew Bynum will be back before they know it—with two healthy knees—and the Philadelphia 76ers will go on to have the glistening season many are projecting. His unexpected three-week precautionary absence due to a bone bruise suffered while recovering from that recent non-invasive Orthokine procedure performed on both his knees in Germany—announced at the start of Media Day here yesterday—will simply be a glitch in the road to their ultimate success. Certainly that’s what they’d all like to