Add manifest for lv_port_renesas_ek-ra8d2

Author: kisvegabor

manifests

@@ -2,6 +2,7 @@ https://raw.githubusercontent.com/lvgl/lv_port_linux/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_pc_eclipse/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_pc_vscode/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_renesas_ek-ra8d1_gcc/master/manifest.json
+https://raw.githubusercontent.com/lvgl/lv_port_renesas_ek-ra8d2/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_renesas_ek_ra8p1/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_renesas_ek-ra6m3g/master/manifest.json
 https://raw.githubusercontent.com/lvgl/lv_port_renesas_rx72n-envision-kit/master/manifest.json