Install new image to sd card for BBB

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Mainly for installing the OpenWRT system on the BBB, following is the steps:

# zImage
cp /media/y/embedded/BBB/svnco/trunk/bin/omap/openwrt-omap-zImage ./zImage
# dtb file
cp /media/y/embedded/BBB/svnco/trunk/bin/omap/dtbs/am335x-boneblack.dtb ./dtbs/