LAPDm_Types: Fix encoding of S+I frames

For some reason, the "FIELDORDER(lsb)" only worked for U-frames,
but not for S- and I-frames.  Probably a TITAN bug, but rather than
debugging that now, let's rewrite the LAPDm types as "FIELDORDER(msb)"
as that appears to work.

Change-Id: Id90ff80576fd8007def4d8d027b481eef693ddc0
1 file changed