[PORT FROM MAIN] VideoDecoderAVC:adjust stpos to not cover next item's SC

BZ: 67980

adjust stpos to not cover next item's start code,using phase is not proper
for phase is alway 4 if parse_sc return find SC.if start code is "0x00,0x00,0x01"
error will happen. adjust stpos due to the least SC lengh 3.

Change-Id: Ia10b7eecd670fa975245df5edc4fcbc251d62c8f
Signed-off-by: ywan171 <yi.a.wang@intel.com>
Reviewed-on: http://android.intel.com:8080/76398
Tested-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: cactus <cactus@intel.com>
Tested-by: cactus <cactus@intel.com>
1 file changed