sysmobts: Make sure we receive every SACCH frame to count S properly

In case there is no transmitter the S counter might never be decreased.
This means that no radio link timeout will not be sent and the lchan will
remain open forever. There are several ways to resolve this.

The first would be to use the MphTimeInd and after each multiframe check
if there has been a SACCH message for the open lchan's. This could be
similar to the trx_meas_check_compute.

I decided to change fBFILevel to always receive SACCH frames and move
the code down to the PDTCH/PACCH handling and update the comment.

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