doc: board: ti: j721e: Convert the image format to svg

Convert the image format into svg that can be reused across platforms as
needed.

Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/doc/board/ti/j721e_evm.rst b/doc/board/ti/j721e_evm.rst
index 5acf730..2d5f649 100644
--- a/doc/board/ti/j721e_evm.rst
+++ b/doc/board/ti/j721e_evm.rst
@@ -128,77 +128,17 @@
 Image formats:
 --------------
 
-- tiboot3.bin:
+- tiboot3.bin
 
-.. code-block:: text
-
-                +-----------------------+
-                |        X.509          |
-                |      Certificate      |
-                | +-------------------+ |
-                | |                   | |
-                | |        R5         | |
-                | |   u-boot-spl.bin  | |
-                | |                   | |
-                | +-------------------+ |
-                | |                   | |
-                | |     FIT header    | |
-                | | +---------------+ | |
-                | | |               | | |
-                | | |   DTB 1...N   | | |
-                | | +---------------+ | |
-                | +-------------------+ |
-                +-----------------------+
+.. image:: img/no_multi_cert_tiboot3.bin.svg
 
 - tispl.bin
 
-.. code-block:: text
-
-                +-----------------------+
-                |                       |
-                |       FIT HEADER      |
-                | +-------------------+ |
-                | |                   | |
-                | |     A72 TF-A      | |
-                | +-------------------+ |
-                | |                   | |
-                | |     A72 OP-TEE    | |
-                | +-------------------+ |
-                | |                   | |
-                | |      R5 DM FW     | |
-                | +-------------------+ |
-                | |                   | |
-                | |      A72 SPL      | |
-                | +-------------------+ |
-                | |                   | |
-                | |   SPL DTB 1...N   | |
-                | +-------------------+ |
-                +-----------------------+
+.. image:: img/dm_tispl.bin.svg
 
 - sysfw.itb
 
-.. code-block:: text
-
-                +-----------------------+
-                |                       |
-                |       FIT HEADER      |
-                | +-------------------+ |
-                | |                   | |
-                | |     sysfw.bin     | |
-                | +-------------------+ |
-                | |                   | |
-                | |    board config   | |
-                | +-------------------+ |
-                | |                   | |
-                | |     PM config     | |
-                | +-------------------+ |
-                | |                   | |
-                | |     RM config     | |
-                | +-------------------+ |
-                | |                   | |
-                | |    Secure config  | |
-                | +-------------------+ |
-                +-----------------------+
+.. image:: img/sysfw.itb.svg
 
 R5 Memory Map:
 --------------