Add 16bit support for unpack, transpose and comparisons operators

[rameshkunasi]

Added 16bit operator support for below operators:

1. unpack
2. transpose
3. comparison

And FC Per channel quantization support using RefC operator

BUG=fixes #3044

[rameshkunasi]

@gonnet can you please review the updated changes

[ddavis-2015]

@suleshahid No unit tests?

[ddavis-2015]

@rameshkunasi I forgot to let you know that whenever a file is updated, its copyright date must also change. Each changed file should have a current year copyright, and only a single year should appear in the copyright. Do not reformat the copyright, as there is a CI check for its format.

[ddavis-2015]

@rameshkunasi !defined(HEXAGON) is needed around all per-channel quantized unit test code for FULLY_CONNECTED.

[rameshkunasi]

@rameshkunasi I forgot to let you know that whenever a file is updated, its copyright date must also change. Each changed file should have a current year copyright, and only a single year should appear in the copyright. Do not reformat the copyright, as there is a CI check for its format.

@ddavis-2015 Updated the changes as per your suggestions

[ddavis-2015]

Looks good to me. On to @suleshahid.