staging:rtl8192u: Remove unused variable

This patch disgards the variable declaration and initialization of
rsn_authen_cipher_suite as it is not used in anywhere throughout
the kernel.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>