staging: rtl8192e: Remove priv->rf_chip in _rtl92e_phy_rf_read

priv->rf_chip is initialized to RF_8256 and never changed. Remove
conditions in function _rtl92e_phy_rf_read as those are dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/c3b2e2a41cc450c1cb9ac41b8ed19b090d9627a6.1679732276.git.philipp.g.hortmann@gmail.com


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