[nrf noup] soc/nordic/nrf54h/pm_s2ram: volatile mcuboot magic

Made _mcuboot_resume struct volatile.
to be squashed.

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

Author: nvlsianpu

soc/nordic/nrf54h/pm_s2ram.c

@@ -225,7 +225,7 @@ static void fpu_restore(_fpu_context_t *backup)
  * `zephyr,memory-region` compatible DT node with nodelabel `mcuboot_s2ram`.
  */
 __attribute__((section(DT_PROP(DT_NODELABEL(mcuboot_s2ram), zephyr_memory_region))))
-struct mcuboot_resume_s _mcuboot_resume;
+volatile struct mcuboot_resume_s _mcuboot_resume;
 
 #define SET_MCUBOOT_RESUME_MAGIC() _mcuboot_resume.magic = MCUBOOT_S2RAM_RESUME_MAGIC
 #else