board/solidrun/mx6cubox: create boot.scr in TARGET_DIR/boot

There is no reason to create boot.scr in board/solidrun/mx6cubox and
later install it in TARGET_DIR/boot, leaving a stale file behind.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/solidrun/mx6cubox/post-build.sh

@@ -2,7 +2,7 @@
 
 BOARD_DIR="$(dirname $0)"
 
-$HOST_DIR/bin/mkimage -A arm -O linux -T script -C none  \
--n "boot script" -d $BOARD_DIR/boot.scr.txt $BOARD_DIR/boot.scr
+install -d -m 755 $TARGET_DIR/boot
 
-install -m 0644 -D $BOARD_DIR/boot.scr $TARGET_DIR/boot/boot.scr
+$HOST_DIR/bin/mkimage -A arm -O linux -T script -C none  \
+	-n "boot script" -d $BOARD_DIR/boot.scr.txt $TARGET_DIR/boot/boot.scr