Decoder: Initialize default reference buffers for all pictures

Reference buffer is now initialized to default value for
each pic before decoding the first slice in the pic

Bug: 34097866
Change-Id: Id64b123af2188217ce833f11db0e6c0681d41dfd
(cherry picked from commit f634481e940421020e52f511c1fb34aac1db4b2f)
1 file changed