[Fix] Support calculate the flops of `matmul` with single dimension matrix (#970)

* Support calculate the flops of matmul

* Remove unnecessary type ignore

* Update mmengine/analysis/jit_handles.py

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

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Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>