staging: rtl8192e: Remove conditions for RF_2T4R

Remove conditions for RF_2T4R because hardware that uses RF_2T4R does not
exist.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/af7dcd620fdad63b2f324d626f1c97601895823a.1677955334.git.philipp.g.hortmann@gmail.com


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