disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/gpu/drm/amd/amdgpu/cik.h
..
..
@@ -30,4 +30,6 @@
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 		     u32 me, u32 pipe, u32 queue, u32 vmid);
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 int cik_set_ip_blocks(struct amdgpu_device *adev);
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+void legacy_doorbell_index_init(struct amdgpu_device *adev);
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+
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 #endif