[PORT FROM R2] hsi_ffl_tty.c: add a TX timeout trace in the logs

[PORT FROM R2] hsi_ffl_tty.c: add a TX timeout trace in the logs

BZ: 16049

This patch is adding a TX timeout trace in the FFL modem protocol driver. It is
also correcting a misleading comment.

Change-Id: I5729c586d67459426bc3a822c0b8d23b90fb6a79
Orig-change-Id: Ic9bdbdcd194eec9b56d57ad71586f81842366a4b
Signed-off-by: Olivier Stoltz Douchet <olivierx.stoltz-douchet@intel.com>
Reviewed-on: http://android.intel.com:8080/31424
Reviewed-by: Robert, Denis <denis.robert@intel.com>
Reviewed-by: Akue, LoicX <loicx.akue@intel.com>
Reviewed-by: Morel, YannickX <yannickx.morel@intel.com>
Reviewed-by: Pillet, VincentX <vincentx.pillet@intel.com>
Reviewed-by: Predon, Frederic <frederic.predon@intel.com>
Reviewed-by: Lebsir, SamiX <samix.lebsir@intel.com>
Tested-by: Lebsir, SamiX <samix.lebsir@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>