Add option to enable tests on OpenCL devices

[Rbiessy]

We are working on adding support for a wider range of devices. In that context it makes sense to allow testing on more devices.

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[Rbiessy]

Log running the tests on OpenCL devices: log_onemkl_opencl_cpu_gpu.txt
I am using -DENABLE_OPENCL_TESTS=ON and my devices are:

$ sycl-ls
[opencl:acc:0] Intel® FPGA Emulation Platform for OpenCL™, Intel® FPGA Emulation Device 1.2 [2022.15.12.0.01_081451]
[opencl:cpu:1] Intel® OpenCL, Intel® Core™ i7-6700K CPU @ 4.00GHz 3.0 [2022.15.12.0.01_081451]
[opencl:gpu:2] Intel® OpenCL HD Graphics, Intel® HD Graphics 530 [0x1912] 3.0 [22.08.22549]

I could not get the lapack tests passing using the Level Zero drivers so I'm not sure the failures seen here are relevant.

This change is useful for our testing with #262 and #259

[mmeterel]

@Rbiessy Could you please add more clarification/motivation for this change? What specific devices are you talking about? The default backend for oneAPI is level_zero, hence we should be promoting level_zero usage. There are also discussions about dropping opencl backend support from oneMKL product, so, this PR kind of conflicts with that.

[Rbiessy]

@mmeterel I was thinking of devices we support in SYCL-BLAS or other Codeplay projects like R-Car, PowerVR or Mali GPUs.
I'll close this MR if we should focus on level_zero instead.

[mmeterel]

@mmeterel I was thinking of devices we support in SYCL-BLAS or other Codeplay projects like R-Car, PowerVR or Mali GPUs. I'll close this MR if we should focus on level_zero instead.

Yes, I think level_zero should be our main focus, unless there is a strong request from users.