meta-mender-tegra: update tegraflash function hooks

The latest update to meta-tegra reworks the way the
flash.xml file is handled, so hook in the modifications
we need for the data partition in the appropriate places.

Signed-off-by: Matt Madison <matt@madison.systems>

meta-mender-tegra/classes/image_types_mender_tegra.bbclass

@@ -7,10 +7,10 @@ tegraflash_custom_pre() {
     ln -s ${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.dataimg ./${DATAFILE}
 }
 
-tegraflash_create_flash_config_append() {
-    if [ -n "$bupgen" ]; then
-        sed -i -e'/DATAFILE/d' $destdir/flash.xml.in
-    else
-        sed -i -e"s,DATAFILE,${DATAFILE}," $destdir/flash.xml.in
-    fi
+tegraflash_generate_bupgen_script_append() {
+    sed -i -e"1a sed -i -e'/DATAFILE/d' ./flash.xml.in" $outfile
+}
+
+tegraflash_custom_post_append() {
+    sed -i -e"s,DATAFILE,${DATAFILE}," ${WORKDIR}/tegraflash/flash.xml.in
 }