Fix the wrong stride for TIMD

Yang Wangrequested to merge
wangyang.cs/ECM:bugfixForTimd into master

Fix the wrong stride for TIMD, which only affects the cost calculation for Horizontal mode during TIMD. No impact on coding performance and running time. AI: {0.00%, 0.00%, 0.00%; 99%, 96%}; RA: {0.00%, 0.00%, 0.00%; 100%, 98%}; LDB: {0.00%, 0.00%, 0.00%; 99%, 97%}

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