add kernel/drivers/base/test

hc

2023-02-27 3a14331c54239033aebd0445c6069c9ac94ee4f5

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# From https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.20.3.tar.xz.sha256sum
sha256  3fedd10560fcdfaa1b6462cbf79a38c4e7b57d7f390359393fc0cef6dbf27dfe  gst-libav-1.20.3.tar.xz
sha256  ad2eec519ebd4b5df86ea84dff24ae3bfa2edea846a703b58902dd221ae375db  COPYING