staging: rtl8192e: Remove unused variable rfTxIQImbalance and rfTxAFE

Remove unused variable rfTxIQImbalance and rfTxAFE because they are just
once set and not used. Remove unused constants.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/62453061bcf1858c23ba57bf1f279999b37b4cc3.1678569965.git.philipp.g.hortmann@gmail.com


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