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For ip.access style TCH/F_PDCH, this fixes switch-back to PDCH in case the TCH use employed encryption. For Osmocom style TCH/F_TCH/H_PDCH, do the same, purely out of sanity. Roughly the same should already be happening during PDCH Chan Activ, but make sure to clear all these fields, so they are cleared even if IEs are missing. From both dyn TS code paths, call new clear_lchan_for_pdch_activ(), which clears the same fields that are normally overwritten by an RSL Chan Activ. Related: OS#3238 Change-Id: I8451039683b54bee910c97c5a3e6873e0ff1b160