Revert "DO NOT MERGE Proper construction of AVDTP general reject message"

This reverts commit 2ed10d442266eade44be121cd24fd473c85007d0.

Original change needs to be reverted to align with Errata
ESR04 where "Section 8.17, General Reject Page 71" of adopted
AvDTP Spec is changed to have "Invalid Signal Identifier"
in first 6 bits of Octet 1.
This change helps passing PTS case TP/SIG/SMG/ESR04/BI-28-C

Change-Id: Idfc960ce00662e8aacc26f3b3fdca9deca8a2aff