add build kerneldeb -- modify dts

hc

2023-10-25 6c2073b7aa40e29d0eca7d571dd7bc590c7ecaa7

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# From https://gstreamer.freedesktop.org/src/gst-devtools/gst-devtools-1.20.3.tar.xz.sha256sum
sha256  bbbd45ead703367ea8f4be9b3c082d7b62bef47b240a39083f27844e28758c47  gst-devtools-1.20.3.tar.xz
sha256  6095e9ffa777dd22839f7801aa845b31c9ed07f3d6bf8a26dc5d2dec8ccc0ef3  validate/COPYING