Since the image_types.bbclass is not cd'ing to ${DEPLOY_DIR_IMAGE}
anymore, do that in a subshell before generating the boostream.
This fixes the following build failure:
ERROR: Error: The image creation script
   '.../core-image-minimal/1.0-r0/temp/create_image.barebox.mxsboot-sdcard' returned 1:
error: unable to find command file imx-bootlets-barebox_ivt.bd-
cfa10058
Change-Id: I5881c6bc333bef42a3f61d07b7bbd6c87c7d45e7
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
 
        barebox_bd_file=imx-bootlets-barebox_ivt.bd-${MACHINE}
 
        # Ensure the files are generated
-       rm -f ${IMAGE_NAME}.barebox.sb ${IMAGE_NAME}.barebox.mxsboot-sdcard
-       elftosb -f mx28 -z -c $barebox_bd_file -o ${IMAGE_NAME}.barebox.sb
-       mxsboot sd ${IMAGE_NAME}.barebox.sb ${IMAGE_NAME}.barebox.mxsboot-sdcard
+       (cd ${DEPLOY_DIR_IMAGE}; rm -f ${IMAGE_NAME}.barebox.sb ${IMAGE_NAME}.barebox.mxsboot-sdcard; \
+        elftosb -f mx28 -z -c $barebox_bd_file -o ${IMAGE_NAME}.barebox.sb; \
+        mxsboot sd ${IMAGE_NAME}.barebox.sb ${IMAGE_NAME}.barebox.mxsboot-sdcard)
 }
 
 # U-Boot mxsboot generation to SD-Card