stm32cube: stm32n6xx: support non-secure execution

Consider when the application executes from non-secure CPU context
that is when CONFIG_TRUSTED_EXECUTION_NONSECURE is enabled.

Signed-off-by: Etienne Carriere <etienne.carriere@st.com>

Author: etienne-lms

stm32cube/stm32n6xx/CMakeLists.txt

@@ -5,6 +5,8 @@ if(CONFIG_BOOTLOADER_MCUBOOT)
 	zephyr_include_directories(soc)
 	zephyr_include_directories(soc/Templates)
 	zephyr_library_sources(soc/system_stm32n6xx_s.c)
+elseif(CONFIG_TRUSTED_EXECUTION_NONSECURE)
+	zephyr_library_sources(soc/system_stm32n6xx_ns.c)
 else()
 	zephyr_library_sources(soc/system_stm32n6xx_fsbl.c)
 endif()