applications: nrf_desktop: Add release note related to enabling LTO

Describe in release notes that LTO is now enabled.

Jira: NCSDK-26866

Signed-off-by: Marek Pieta <[email protected]>
Signed-off-by: Pekka Niskanen <[email protected]>

Author: MarekPieta

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -233,6 +233,8 @@ nRF Desktop
   * The :ref:`nrf_desktop_failsafe` to use the Zephyr :ref:`zephyr:hwinfo_api` driver for getting and clearing the reset reason information (see the :c:func:`hwinfo_get_reset_cause` and :c:func:`hwinfo_clear_reset_cause` functions).
     The Zephyr :ref:`zephyr:hwinfo_api` driver replaces the dependency on the nrfx reset reason helper (see the :c:func:`nrfx_reset_reason_get` and :c:func:`nrfx_reset_reason_clear` functions).
   * The release configuration for the :ref:`zephyr:nrf54h20dk_nrf54h20` board target to enable the :ref:`nrf_desktop_failsafe` (see the :ref:`CONFIG_DESKTOP_FAILSAFE_ENABLE <config_desktop_app_options>` Kconfig option).
+  * Enabled Link Time Optimization (:kconfig:option:`CONFIG_LTO` and :kconfig:option:`CONFIG_ISR_TABLES_LOCAL_DECLARATION`) by default for an nRF Desktop application image.
+    LTO was also explicitly enabled in configurations of other images built by sysbuild (bootloader, network core image).
 
 * Added: