modules: mcuboot: Remove deprecated security warning from Kconfig

The warning is no longer true.
RAM is cleared by MCUboot before starting the application.

Ref: NCSDK-28492

Signed-off-by: Adam Szczygieł <[email protected]>

Author: adsz-nordic

modules/mcuboot/Kconfig

@@ -65,12 +65,10 @@ config USE_NRF53_MULTI_IMAGE_WITHOUT_UPGRADE_ONLY
 	  of bricking the network core upon reverts.
 
 config MCUBOOT_USE_ALL_AVAILABLE_RAM
-	bool "Allow MCUBoot to use all available RAM (security implications)"
+	bool "Allow MCUBoot to use all available RAM"
 	depends on ARM_TRUSTZONE_M
 	default y if BOARD_THINGY53_NRF5340_CPUAPP_NS || BOARD_THINGY53_NRF5340_CPUAPP
 	help
-	  By default MCUBoot uses only the secure RAM partition. Enabling this
-	  may allow secrets to be leaked to non-secure through the non-secure
-	  RAM partition.
+	  By default MCUBoot uses only the secure RAM partition.
 
 endmenu

sysbuild/Kconfig.mcuboot

@@ -178,12 +178,10 @@ config BOOT_SHARED_CRYPTO_ECDSA_P256
 endif
 
 config MCUBOOT_USE_ALL_AVAILABLE_RAM
-	bool "Allow MCUboot to use all available RAM (security implications)"
+	bool "Allow MCUboot to use all available RAM"
 	depends on BOARD_IS_NON_SECURE
 	help
-	  By default MCUboot uses only the secure RAM partition. Enabling this
-	  may allow secrets to be leaked to non-secure through the non-secure
-	  RAM partition.
+	  By default MCUboot uses only the secure RAM partition.
 
 config MCUBOOT_NRF53_MULTI_IMAGE_UPDATE
 	bool "Network core multi-image update (in single operation)"