Fix encoder crashes and enc/dec mismatches

This commit adds the logic for segmentation map initialization and
disable temporal update of segmentation map when error-resilient
mode is on. It fixes the enc/dec mistmates (release build) and
assertions(debug) when both aq-mode and error-resilient are on.

Change-Id: Id2155e8b28962cf1f64494f4df0c8d79499b6890