feat(android): AM62PX: add dtbo index for RPI 7inch touchscreen

Document device tree overlay index for the new
RPI 7 inch touchscreen DSI panel.

Signed-off-by: Maxime Fournier <[email protected]>

Author: FournierMx

source/devices/AM62PX/android/Application_Notes_dtbo_support.rst

@@ -46,3 +46,5 @@ The following Device-Tree Overlays are supported:
      - Microtips Technology USA 10.1” WUXGA (1920x1200) OLDI panel
    * - 12
      - M.2-CC3301 WiFi board on the M.2 connector
+   * - 14
+     - RPi 7inch touchscreen DSI panel