feat(android): beagleplay: Document to use snagboot 1.3.0

The other boards explicitely tell to install snagboot 1.3.0. They also mention
the udev rules to make sure they are installed.

Do the same for the BeaglePlay board.

Signed-off-by: Mattijs Korpershoek <[email protected]>

Author: Mattijs Korpershoek

source/devices/AM62X/android/Application_Notes_BeaglePlay.rst

@@ -13,8 +13,15 @@ Initial Flashing procedure
 
 Flashing Android the first time requires booting from DFU.
 
-First, make sure to install ``snagboot`` following
-the `official instructions <https://github.com/bootlin/snagboot>`_
+First, install snagboot 1.3.0 following the `official instructions <https://github.com/bootlin/snagboot>`_
+Make sure to install the udev rules as documented:
+
+.. code-block:: console
+
+   $ snagrecover --udev > 50-snagboot.rules
+   $ sudo cp 50-snagboot.rules /etc/udev/rules.d/
+   $ sudo udevadm control --reload-rules
+   $ sudo udevadm trigger
 
 Then, the following steps are required: