Experimental support for 5x5 convolution on CPU

[primenumber]

part of #475 .

Motivation and Context

5x5 convolution is desired by #435 and other networks.
Almost of all routines are already supports 5x5 convolution, but not tested well...

Description

In 5x5 convolution, maximum number of channel is limited by 436 (= floor(32767 / (5*5 * 3))).
So assertion are used to check this constraints.

How has this been tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[primenumber]

How to test 5x5 conv...?
Do you have any idea? @tkng

[primenumber]

notice: current FPGA implementation cannot execute 5x5 conv

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[primenumber]

I gave up 5x5 conv on TCAv2 by this branch.
5x5 conv for TCAv2 may be supported later PR.

[iizukak]

Ownership Approval

[primenumber]

/ready

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