[Quantization] Allow running end2end quantization tests on OpenCL backend

[rdzhabarov]

Currently, there are two end2end tests for quantization which make sure that we can:

• Profile and Quantize the graph
• Execute inference for the quantized graph on a specific backend

Note that Profiling is always done with the Interpreter backend. While quantizing and inference is run on a specific backend.

See here for the reference.

@ZchiPitt we've been talking about this. Created this issue just to make sure it's not lost.

[rdzhabarov]

This is fixed, isn't it? @ZchiPitt If so, please, close this.

[ZchiPitt]

not exactly, end2endGRU still needs topk instr to be supported

[rdzhabarov]

Can you please update with the status on what's done and what's pending/planned.

[ZchiPitt]

end2end is fully supported, while end2endGRU stopped when complaining about unsupported topk

[ZchiPitt]

i believe we only two end2end tests, right

[rdzhabarov]

end2endGRU was fixed, closing this issue. Great work @ZchiPitt