staging: r8188eu: remove HW_VAR_AC_PARAM_BK

Remove HW_VAR_AC_PARAM_BK from SetHwReg8188EU() and call
rtw_write32() directly.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220130190321.7172-7-straube.linux@gmail.com


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