[master][bugfix] Zero initialization to avoid error message on a Centos

[mozga-intel]

Description

Zero initialization (**) to avoid error message on a Centos: error: [-Werror=maybe-uninitialized] is used to allows the user to selectively enable or disable certain types of diagnostics, and change the kind of the diagnostic. A Centos has shown an error message that '*((void*)& param +129)' may be used uninitialized in this function - as follows:

/work/mxnet/src/api/operator/numpy/random/../../../../operator/numpy/random/np_choice_op.h:43:8: error: '*((void*)& param +129)' may be used uninitialized in this function [-Werror=maybe-uninitialized]

[2021-09-03T20:41:39.011Z]  struct NumpyChoiceParam : public dmlc::Parameter<NumpyChoiceParam> {

[2021-09-03T20:41:39.011Z]         ^~~~~~~~~~~~~~~~

[2021-09-03T20:41:39.011Z] /work/mxnet/src/api/operator/numpy/random/np_choice_op.cc:40:24: note: '*((void*)& param +129)' was declared here

[2021-09-03T20:41:39.011Z]    op::NumpyChoiceParam param;

(**) Following the doc:

As part of value-initialization sequence for non-class types and for members of value-initialized class types that have no constructors, including value initialization of elements of aggregates for which no initializers are provided.

Future consideration:

1. Zero initialization might be added to support other objects.

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

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