staging: rtl8192e: Remove rf_chip in _rtl92e_get_supported_wireless_mode

priv->rf_chip is initialized to RF_8256 and never changed. Remove
condition in function _rtl92e_get_supported_wireless_mode as it is dead
code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/e2db309dea3208560337376fec26fa5cfba93848.1679732276.git.philipp.g.hortmann@gmail.com


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