IVGCVSW-4390 Refactor QUANTIZE to make use of Decoder/Encoder types
IVGCVSW-4390 Refactor QUANTIZE to make use of Decoder/Encoder types

 * Fix bug where QSymmS8 is duplicated and F16 is missing

Signed-off-by: Keith Davis <7faa8f12f0117baa753e7a8fa749e23c4deb1fe7@arm.com>
Change-Id: I312815868e74a9dff913bac052f1a86585644098

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn