cmake: modules: Prefer imgtool being in MCUboot directory

Changes the priority of imgtool so that the preferred version is
the one inside of the MCUboot directory

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

cmake/modules/FindHostTools.cmake

@@ -61,9 +61,10 @@ find_program(OPENOCD openocd)
 # bossac is an optional dependency
 find_program(BOSSAC bossac)
 
-# imgtool is an optional dependency (the build may also fall back to scripts/imgtool.py
-# in the mcuboot repository if that's present in some cases)
-find_program(IMGTOOL imgtool)
+# imgtool is an optional dependency (prefer the version that is in the mcuboot repository, if
+# present and a user has not specified a different version)
+zephyr_get(IMGTOOL SYSBUILD LOCAL)
+find_program(IMGTOOL imgtool.py HINTS ${ZEPHYR_MCUBOOT_MODULE_DIR}/scripts/ NAMES imgtool NAMES_PER_DIR)
 
 # winpty is an optional dependency
 find_program(PTY_INTERFACE winpty)