staging:rtl8192u: Remove unused structure QOS_TSTREAM - Style

The structure QOS_TSTREAM is unused in code so has simply been removed.
This change is a coding style change and should have no impact on runtime
code execution.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>