soc: nxp_kinetis: Mark __kinetis_flash_config with __used attribute

This is a fix for issue #90426 .
Marking __kinetis_flash_config  with __used attribute prevents
unwanted deletion when compiling with LTO.

Signed-off-by: Matthieu Speder <[email protected]>

Author: mspeder

soc/nxp/kinetis/flash_configuration.c

@@ -7,7 +7,7 @@
 #include <zephyr/kernel.h>
 #include <zephyr/linker/sections.h>
 
-uint8_t __kinetis_flash_config_section __kinetis_flash_config[] = {
+uint8_t __used __kinetis_flash_config_section __kinetis_flash_config[] = {
 	/* Backdoor Comparison Key (unused) */
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,