### What this PR does / why we need it?
This PR fixes a bug that use broadcast with cpu_group when running dp.
The `broadcast310p` patch will take effects for both cpu_group and
device group, but we only need it for device group. Hence a wrapper is
added to allow cpu_group use native torch broadcast and it solves the
bug.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
With this PR, DP on 310p runs normally and generates reasonable answers.
Signed-off-by: angazenn <zengyanjia@huawei.com>
Co-authored-by: angazenn <zengyanjia@huawei.com>
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