v3dv: assert on vkCreateComputePipelines

So we can quickly identify tests that crash because they use compute shaders

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
diff --git a/src/broadcom/vulkan/v3dv_pipeline.c b/src/broadcom/vulkan/v3dv_pipeline.c
index eab5559..b1ed9ae 100644
--- a/src/broadcom/vulkan/v3dv_pipeline.c
+++ b/src/broadcom/vulkan/v3dv_pipeline.c
@@ -2012,3 +2012,14 @@
 
    return result;
 }
+
+VkResult
+v3dv_CreateComputePipelines(VkDevice device,
+                            VkPipelineCache pipelineCache,
+                            uint32_t createInfoCount,
+                            const VkComputePipelineCreateInfo *pCreateInfos,
+                            const VkAllocationCallbacks *pAllocator,
+                            VkPipeline *pPipelines)
+{
+   unreachable("vkCreateComputePipelines not implemented");
+}