Swae & Post go for gold. In the week ending with January 12th, Swae Lee and Post Malone have nabbed the top spot on the Hot R&B/Hip-Hop Songs charts for their collaborative “Sunflower” joint. It now becomes the third No. 1 track on the chart for Post, who previously earned the distinction with his 21 Savage-assisted “Rockstar,” which spent 14 weeks at …