applications: nrf_desktop: Enable LTO

Change enables the Link Time Optimization (LTO) by default for nRF
Desktop application image to limit memory usage and improve
performance.

Jira: NCSDK-26866

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

Author: MarekPieta

applications/nrf_desktop/Kconfig.defaults

@@ -21,3 +21,13 @@ choice LIBC_IMPLEMENTATION
 	help
 	  Use minimal libc implementation to reduce memory footprint.
 endchoice
+
+config LTO
+	default y
+	help
+	  nRF Desktop enables LTO to limit memory usage and improve performance.
+
+config ISR_TABLES_LOCAL_DECLARATION
+	default y
+	help
+	  nRF Desktop enables LTO to limit memory usage and improve performance.