doc/release-note: mcuboot bootutil_public library record

Added note on MCUBoot's bootutil_public library
introduction.

Signed-off-by: Andrzej Puzdrowski <[email protected]>

Author: nvlsianpu

doc/releases/release-notes-2.5.rst

@@ -304,6 +304,12 @@ Libraries / Subsystems
 
 * Debug
 
+* DFU
+
+ * boot: Reworked using MCUBoot's bootutil_public library which allow to use
+   API implementation already provided by MCUboot codebase and remove
+   zephyr's own implementations.
+
 HALs
 ****
 
@@ -342,6 +348,8 @@ MCUBoot
   * Configure logging to LOG_MINIMAL by default.
   * boot: cleanup NXP MPU configuration before boot.
   * Fix nokogiri<=1.11.0.rc4 vulnerability.
+  * bootutil_public library was extracted as code which is common API for
+    MCUboot and the DFU application, see ``CONFIG_MCUBOOT_BOOTUTIL_LIB``
 
 * imgtool