scripts: add u-boot directory. [1/2]

PD#SWPL-102140

Problem:
add mcuboot for RTOS.

Solution:
add u-boot directory.

Verify:
N/A

Change-Id: I5b24e0c6dadb411a72bef1090397228e32c3b10e
Signed-off-by: shijie.xiong <shijie.xiong@amlogic.com>
diff --git a/package.sh b/package.sh
index 2b7cf0a..90960a7 100755
--- a/package.sh
+++ b/package.sh
@@ -206,7 +206,7 @@
         echo "Select board($BOARD) not support compile uboot"
         exit 1
     else
-        pushd $RTOS_BUILD_DIR/boot/
+        pushd $RTOS_BUILD_DIR/boot/u-boot
         ./mk $UBOOT_BOARDNAME
         test -f build/u-boot.bin && cp -av build/u-boot.bin* $PROJECT_BUILD_OUT_IMAGE_PATH
         popd