Merge "better manage buffer for libstagefright_soft_mpeg4enc" into klp-dev am: 021575025c am: 5944b611e5 am: 1a419c7b2a am: 70a63bdf27 am: 40833da7b9
am: 2ad98cf1c7

Change-Id: Ib1856e8073d36b874ac3280b31d69da5afb7878f