[ALPS09070588] Camera splitter bug fix

[Description]
1. Solution from Google bug id: 355537202
2. mLock is temporarily removed during attachBuffer call, need to check
if graphic producer is invalid to avoid putting the stream in abandoned
state

[Test]
1. pdas, ATE+

Flag: EXEMPT bugfix
Bug: 355537202
Bug: 377421083
CR-Id: ALPS09070588
Feature: [Android Default] Camera Application Basic Functions
Change-Id: I0eebecac622d9796d104be50a88a93d9e9896dcf