Lima can't do *both* FP16 *and* 4x MSAA at the same time. And because
GLES2 requires MAX_SAMPLES to be valid for *all* supported formats,
this means we can't support MSAA at all unless we disable support for
the FP16 formats when used as render-targets.
To allow applications that needs FP16 render-targets to still support
it, we introduce a driconf that makes the opposite trade; support FP16,
but not 4x MSAA. Unfortunately, we can't support both, and still be
following the spec.
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35207>
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