docs(linux): AM62AX: add falcon mode to release notes

The release notes for AM62AX were missing any mention of the falcon mode
feature, add it to make it consistent with other falcon supported
platforms.

Signed-off-by: Anshul Dalal <[email protected]>

Author: ArchUsr64

source/devices/AM62AX/linux/Release_Specific_Release_Notes.rst

@@ -45,7 +45,8 @@ What's new
 
 **Processor SDK Linux AM62AX Release has following new features:**
 
-- First 2025 LTS Reference Release Including RT combined branch model
+  - First 2025 LTS Reference Release Including RT combined branch model
+  - Falcon mode through R5 SPL :ref:`U-Boot Falcon Mode <U-Boot-Falcon-Mode>`
   - Important Bug Fixes on top of Processor SDK 10.01.10.04 Release
   - Review Issue Tracker Section for the new fixes.