drm/amdgpu: Make amdgpu_mn functions inline

Unused amdgpu_mn functions threw warnings for every file that includes
amdgpu.h. It makes sense to inline this amdgpu_mn stubs to avoid the warning.

Signed-off-by: Harry Wentland <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Cc: [e-mail]

drivers/gpu/drm/amd/amdgpu/amdgpu.h

···
 int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr);
 void amdgpu_mn_unregister(struct amdgpu_bo *bo);
 #else
-static int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
+static inline int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 {
 	return -ENODEV;
 }
-static void amdgpu_mn_unregister(struct amdgpu_bo *bo) {}
+static inline void amdgpu_mn_unregister(struct amdgpu_bo *bo) {}
 #endif
 
 /*