staging: rtl8192e: Remove unused variable rfRxIQImbalance and rfRxAFE

Remove unused variable rfRxIQImbalance and rfRxAFE because they are just
once set and not used. Remove unused constants with commenting line.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/1d578fc962c938e76bc0df529a3c24bba7abe049.1678569965.git.philipp.g.hortmann@gmail.com


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