staging: rtl8192e: Remove unused RF90_PATH_C and ..D in rtl92e_config_rf

Remove unused case RF90_PATH_C and case RF90_PATH_D. The termination
condition for the loop is set to
priv->num_total_rf_path = RTL819X_TOTAL_RF_PATH = 2. Because of this
eRFPath cannot reach the values 2 for RF90_PATH_C and 3 for RF90_PATH_D.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/3a62c8803712e7bf905886e670fe334a13d5d753.1678569965.git.philipp.g.hortmann@gmail.com


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