staging: rtl8723bs: remove rf type branching (third patch)

remove rf_type struct member, keep all 1T1R code
unconditionally, remove the other *T*R branches.
Removed dead code related to MCS indexes above 7.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/e626790eb8bd7d96f939e1bbb47b899bf12dab0d.1628329348.git.fabioaiuto83@gmail.com


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