HAL: Identify the track offload session

   The current logic for identifying the track offload
   session is using strlcat in wrong way, third parameter
   is given the string length to be appended, but in fact
   it should be the size of the destination buffer.

   Due to this the string returned is missing the last
   character, in case of "true", it contains "tru" due this
   the session is not considered as a track offload by the
   calling module. To fix this use sizeof of the destination
   buffer instead of string length of string to be appended.

Change-Id: I3d456aad2ca49095a0dfe5883f4374e22a437256
CRs-Fixed: 946670