staging: rtl8192u: remove commented-out code in r819xU_cmdpkt.c

This patch removes commented-out code and the comments
that refer to it to facilitate code review.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>