Discrete platforms don't have LLC, but on those, we mmap our buffers
with WC. So we shouldn't need to clflush there.
Anv already had a boolean field on the physical device to know whether
we need to use clflush(), based off the memory heaps available. So use
that instead.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15780>
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