bpf: Add BTF_ID_LIST_GLOBAL_SINGLE macro

Same as BTF_ID_LIST_SINGLE macro except defines a global ID.
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/a867a97517df42fd3953eeb5454402b57e74538f.1629772842.git.dxu@dxuuu.xyz

include/linux/btf_ids.h

@@ -82,6 +82,9 @@ __BTF_ID_LIST(name, globl)
 #define BTF_ID_LIST_SINGLE(name, prefix, typename)	\
 	BTF_ID_LIST(name) \
 	BTF_ID(prefix, typename)
+#define BTF_ID_LIST_GLOBAL_SINGLE(name, prefix, typename) \
+	BTF_ID_LIST_GLOBAL(name) \
+	BTF_ID(prefix, typename)
 
 /*
  * The BTF_ID_UNUSED macro defines 4 zero bytes.