staging: r8188eu: remove HW_VAR_AC_PARAM_BE from SetHwReg8188EU()

Remove the HW_VAR_AC_PARAM_BE case from SetHwReg8188EU() and move the
functionality to the place where SetHwReg8188EU() is called. This is
part of the ongoing effort to get rid of the unwanted hal layer.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220516054830.8702-1-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>