Default HIP_PATH does not work with ROCm >= 6.0

hip_path.cmake still defaults to /opt/rocm/hip for HIP_PATH which does not work with ROCm 6.0:

set(HIP_PATH "/opt/rocm/hip" CACHE PATH "Path to which HIP has been installed")

Furthermore, hip.cmake has a code path where $ENV{HIP_PATH}/.. is used for `ROCM_PATH:

Line 20 in a8a407f

    
           set(ROCM_PATH "$ENV{HIP_PATH}/.." CACHE PATH "Path to which ROCM has been installed")

It would be nice if Ginkgo could auto-detect ROCm version and use the correct paths for 6.0 by default 😉

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