When caching NIR, it's cached as a raw object because we cache the
serialized NIR. When it's then loaded from the disk cache later, we
fail to deserialize it because raw objects are a special case. There
are two callers of vk_pipeline_cache_object_deserialize(), one of which
has a special case for raw objects and the other is called only when
we've checked that it isn't a raw object. The special cases are
pointless; raw objects should deserialize themselves.
Fixes: 591da98779 ("vulkan: Add a common VkPipelineCache implementation")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16281>
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