cmake: mcuboot: prefer confirmed image when one is created

Prefer flashing the confirmed image when one is created with
CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE. This way, the west runner will
flash this image over the signed image if it exists.

Signed-off-by: Daniel DeGrasse <ddegrasse@tenstorrent.com>

Author: danieldegrasse

cmake/mcuboot.cmake

@@ -177,6 +177,7 @@ function(zephyr_mcuboot_tasks)
       set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND
                    ${imgtool_sign} ${imgtool_args} --pad --confirm ${output}.bin
                    ${output}.signed.confirmed.bin)
+      zephyr_runner_file(bin ${output}.signed.confirmed.bin)
     endif()
 
     if(NOT "${keyfile_enc}" STREQUAL "")
@@ -240,6 +241,7 @@ function(zephyr_mcuboot_tasks)
       set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND
                    ${imgtool_sign} ${imgtool_args} --pad --confirm ${output}.hex
                    ${output}.signed.confirmed.hex)
+      zephyr_runner_file(hex ${output}.signed.confirmed.hex)
     endif()
 
     if(NOT "${keyfile_enc}" STREQUAL "")