staging: r8188eu: Fixed comment style

Fixed block comments style as per checkpatch.pl and kernel coding style
guide.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Chang Yu <marcus.yu.56@gmail.com>
Link: https://lore.kernel.org/r/fe45dd24a6ffcb4902a5efacaae63028f7c7a68f.1655872968.git.marcus.yu.56@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>