[nrf fromtree] bootloader: mcuboot: Fix encryption not being selected in bootloader

In some cases this resulted in the device not booting.

Signed-off-by: Artur Hadasz <[email protected]>
(cherry picked from commit b43ce97)

Author: ahasztag

share/sysbuild/image_configurations/BOOTLOADER_image_default.cmake

@@ -80,6 +80,7 @@ foreach(loopkeytype ${keytypes})
 endforeach()
 
 if(SB_CONFIG_BOOT_ENCRYPTION)
+  set_config_bool(${image} CONFIG_BOOT_ENCRYPT_IMAGE y)
   set_config_string(${ZCMAKE_APPLICATION} CONFIG_BOOT_ENCRYPTION_KEY_FILE "${SB_CONFIG_BOOT_ENCRYPTION_KEY_FILE}")
   if(SB_CONFIG_BOOT_ENCRYPTION_ALG_AES_128)
     set_config_bool(${ZCMAKE_APPLICATION} CONFIG_BOOT_ENCRYPT_ALG_AES_128 y)