[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/meta/meta-mediatek-mt2731-gpl/LICENSE b/meta/meta-mediatek-mt2731-gpl/LICENSE
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+++ b/meta/meta-mediatek-mt2731-gpl/LICENSE
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+All metadata in this layer is MIT licensed unless otherwise stated, see COPYING.MIT.
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