env: Move callback definitions to env.h

These definitions are effectively part of the 'public' API of the
environment implementation since they do not require access to any
internal variables. Move them to the env.h header.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

include/env_callback.h

@@ -72,29 +72,6 @@
 	"serial#:serialno," \
 	CONFIG_ENV_CALLBACK_LIST_STATIC
 
-struct env_clbk_tbl {
-	const char *name;		/* Callback name */
-	int (*callback)(const char *name, const char *value, enum env_op op,
-		int flags);
-};
-
 void env_callback_init(ENTRY *var_entry);
 
-/*
- * Define a callback that can be associated with variables.
- * when associated through the ".callbacks" environment variable, the callback
- * will be executed any time the variable is inserted, overwritten, or deleted.
- */
-#ifdef CONFIG_SPL_BUILD
-#define U_BOOT_ENV_CALLBACK(name, callback) \
-	static inline __maybe_unused void _u_boot_env_noop_##name(void) \
-	{ \
-		(void)callback; \
-	}
-#else
-#define U_BOOT_ENV_CALLBACK(name, callback) \
-	ll_entry_declare(struct env_clbk_tbl, name, env_clbk) = \
-	{#name, callback}
-#endif
-
 #endif /* __ENV_CALLBACK_H__ */