sysbuild: Add missing option for MCUboot encryption support

Adds a missing 'default y' for the Kconfig option indicating that
encryption is supported with the current configuration

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

share/sysbuild/images/bootloader/Kconfig

@@ -151,6 +151,7 @@ config BOOT_SIGNATURE_KEY_FILE
 config SUPPORT_BOOT_ENCRYPTION
 	bool
 	depends on !BOOT_SIGNATURE_TYPE_NONE && !MCUBOOT_MODE_DIRECT_XIP && !MCUBOOT_MODE_DIRECT_XIP_WITH_REVERT && !MCUBOOT_MODE_FIRMWARE_UPDATER
+	default y
 
 config BOOT_ENCRYPTION
 	bool "Encrypted image support"