nitrogen6x: use install instead of cp

in order to not depend on the previous permissions of each file

Signed-off-by: Guido Martínez <guido@vanguardiasur.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/boundarydevices/nitrogen6x/post-build.sh

@@ -8,11 +8,11 @@
 BOARD_DIR="$(dirname $0)"
 
 # bd u-boot looks for bootscript here
-cp $BOARD_DIR/6x_bootscript $TARGET_DIR
+install -D -m 0644 $BOARD_DIR/6x_bootscript $TARGET_DIR/6x_bootscript
 
 # u-boot / update script for bd upgradeu command
 if [ -e $BINARIES_DIR/u-boot.imx ];
 then
-    cp $BINARIES_DIR/u-boot.imx $TARGET_DIR
-    cp $BOARD_DIR/6x_upgrade $TARGET_DIR
+    install -D -m 0644 $BINARIES_DIR/u-boot.imx $TARGET_DIR/u-boot.imx
+    install -D -m 0644 $BOARD_DIR/6x_upgrade $TARGET_DIR/6x_upgrade
 fi