Changes

osmo_trau_frame_decode_8k: fix recognition of O&M UL

In the case of an O&M frame in UL direction, the bit pattern
in C1-C5 is 01011, not 10011 - see TS 48.061 section 5.2.4.1.1.

Change-Id: I16c6b598ce5c843b5306aa69592a7d66723622d4