staging: rtl8192u: Fixing no new typedef warning

This patch fixes following checkpatch.pl
warnings: WARNING:do not add new typedefs.
All the related files have been modified.

Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>