Revert "send TCH/F fill frames in DTX mode (WIP)"
Revert "send TCH/F fill frames in DTX mode (WIP)"

This reverts commit 9bffa87c1195d2977d49244fbc3e3c0c9b65c318.

This commit was not intended to be merged yet.

Change-Id: Ibd8c0899451ae3c17bc07d4e112e32b4897405c9

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts