doc: board: ti: *: Add platform information

Add link to the actual platform for folks to find details about the
board in addition to the SoC's TRM.

Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/doc/board/ti/am65x_evm.rst b/doc/board/ti/am65x_evm.rst
index fcb5f1c..0129235 100644
--- a/doc/board/ti/am65x_evm.rst
+++ b/doc/board/ti/am65x_evm.rst
@@ -24,6 +24,10 @@
 
 More info can be found in TRM: http://www.ti.com/lit/pdf/spruid7
 
+Platform information:
+
+* https://www.ti.com/tool/TMDX654GPEVM
+
 Boot Flow:
 ----------
 On AM65x family devices, ROM supports boot only via MCU(R5). This means that