staging: rtl8192e: Remove variables tsf, beacon_time and Antenna

Remove unused variables tsf, beacon_time and Antenna.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/8f400e46ed16ec7a226284c42654855b2aba6502.1708461563.git.philipp.g.hortmann@gmail.com


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