Make quantization rounding consistentHEADmain

In NEQuantizeLayer for QASYMM8_SIGNED, the rounding was inconsistent
between the unrolled loop and the leftover loop, which meant identical
values (e.g. 0.5) at different indices of a Tensor could round to
different values (0 or 1 in this case). We have changed vcvtaq to
vcvtnq to round to the nearest, with ties to even. This matches the
default fegetround setting, so it is a sensible default.

Relates-to: COMPMID-6994
Signed-off-by: Jonathan Deakin <jonathan.deakin@arm.com>
Change-Id: I8e7ecb1b8dbdd3e887697a92046af99ed33fc78f
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/11532
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>

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