build-arm-images: add odroid-c2 and rpi3.

build-arm-images.sh.in

@@ -3,7 +3,7 @@
 TARGET="$1"
 [ -n "$TARGET" ] && shift
 
-: ${PLATFORMS:="beaglebone cubieboard2 odroid-u2 rpi rpi2 usbarmory"}
+: ${PLATFORMS:="beaglebone cubieboard2 odroid-c2 odroid-u2 rpi rpi2 rpi3 usbarmory"}
 DATE=$(date '+%Y%m%d')
 
 for f in ${PLATFORMS} x ${PLATFORMS} ; do