Decoder: Detect change of mbaff flag in SPS Change in Mbaff flag needs re-initialization of NMB group and other variables in decoder context. Bug: 64380237 Test: ran poc on ASAN before/after Change-Id: I0fc65e4dfc3cc2c15528ec52da1782ecec61feab (cherry picked from commit d524ba03101c0c662c9d365d7357536b42a0265e)