vulkan : do not use tensor->extra (#9407)
* vulkan : do not use tensor->extra
This patch allows using the Vulkan backend with the RPC backend as
tensor->extra is no longer used.
Ref: #8536
* Adapt GGML_VULKAN_CHECK_RESULTS to extra removal (#2)
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Co-authored-by: 0cc4m <picard12@live.de>
