use ts_declaration for module that only declares externs

PiperOrigin-RevId: 333740638
material-components · Sep 25, 2020 · 199aecd · 199aecd
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diff --git a/packages/mdc-base/externs.ts → packages/mdc-base/externs.d.ts b/packages/mdc-base/externs.ts → packages/mdc-base/externs.d.ts