staging: rtl8192e: Remove unused variables txviok.., txvook.. and txbea..

txviokint, txvookint and txbeaconokint are initialized and increased but
never read. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/c45501eee5fbf2cc3e5ad999bbbe8e071e341a2c.1674675808.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>