A turnaround in the fortunes of its largest customer could help this chipmaker deliver more upside.Share prices of Cirrus Logic (CRUS -0.04%) have been in fine form so far in 2024, clocking gains of 48% as Wall Street turns bullish on the chipmaker's prospects. The market is excited about a turnaround in the smartphone market, its solid quarterly results, and a potential improvement in the fortunes of its largest customer -- Apple (AAPL 0.40%).After all, Cirrus is highly reliant on Apple for a major chunk o ...