MANILA, Philippines — East West Banking Corp. posted a modest increase in first-quarter net income to P1.9 billion from P1.8 billion a year earlier, despite market volatility and higher provisions for credit losses. In a disclosure on Thursday, the Gotianun-led bank said revenues had risen 15 percent to P13.3 billion in the January-to-March period. Net interest income climbed 20 percent to P11.1 billion, driven by higher loan volumes and better …