staging: rtl8192u: fix comments in r819xU_cmdpkt.c

This patches fixes comments by:
- replacing // comments with /**/ comments
- removing unnecessary comments (trailing comments
  with the function name, comments stating date/author
  when they are placed inside the function definition)
- fixing internal alignment
Signed-off-by: NXenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>