set minimum ROCm version

[CongMa13]

The solution in /~https://github.com/ROCm/rocBLAS/blob/develop/CMakeLists.txt stopped working in /~https://github.com/ROCm/hipTensor/pull/326/checks?check_run_id=35951788707

The reason is that rocm-cmake trys to extract the rocm version ROCM_PLATFORM_VERSION from variable ROCM_DIR.

ROCM_DIR is supposed to be something like /opt/rocm-6.3.3/. But this is not mandatory. For example, in GFX942 CI pipeline, ROCM_DIR is '/agent/_work/1/rocm/share/rocm/cmake' (real path).

So ROCM_PLATFORM_VERSION is not defined in GFX942 CI pipeline.

---

The real goal of this ticket is to check if the compiler support __hip_fp8_e5m2 and __hip_fp8_e4m3.

Created a cmake macro to check if the detected ROCm supports them.

The image below shows that cmake command fails with ROCm 6.2

[cgmillette]

lgtm