Removed unnecessary conditions in op_add and op_mul (#7135)

* Removed unnecessary conditions in op_add and op_mul
Added scalar function call in op_add and op_mul
Updated undefining of macros in op_quantize
Updated elseif() instead of if() in op_cat

Signed-off-by: cmadhira@cadence.com <mckala@invecas.com>

* Removed linter errors

Signed-off-by: cmadhira@cadence.com <mckala@invecas.com>

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Signed-off-by: cmadhira@cadence.com <mckala@invecas.com>
Co-authored-by: cmadhira@cadence.com <mckala@invecas.com>