verification/dot2k: Delete duplicate imports

The presence of duplicate import lines appears to be a typo.
Removing them.

Link: https://lore.kernel.org/r/20230906155703.3917918-1-alessandro.carminati@gmail.com

Fixes: 24bce201 ("tools/rv: Add dot2k")
Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@gmail.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>

tools/verification/dot2/dot2k

@@ -15,8 +15,6 @@ if __name__ == '__main__':
     import os
     import platform
     import sys
-    import sys
-    import argparse
 
     parser = argparse.ArgumentParser(description='transform .dot file into kernel rv monitor')
     parser.add_argument('-d', "--dot", dest="dot_file", required=True)