of: reserved-memory: Add stub for RESERVEDMEM_OF_DECLARE()

The reserved-memory Kconfig could be disabled when drivers are
compile-tested. In this case RESERVEDMEM_OF_DECLARE() produces a
noisy warning about the orphaned __reservedmem_of_table section.
Add the missing stub that fixes the warning. In particular this is
needed for compile-testing of NVIDIA Tegra210 memory driver which
uses reserved-memory.

Reported-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Dmitry Osipenko <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

include/linux/of.h

···
 	return num;
 }
 
+#define _OF_DECLARE_STUB(table, name, compat, fn, fn_type)		\
+	static const struct of_device_id __of_table_##name		\
+		__attribute__((unused))					\
+		 = { .compatible = compat,				\
+		     .data = (fn == (fn_type)NULL) ? fn : fn }
+
 #if defined(CONFIG_OF) && !defined(MODULE)
 #define _OF_DECLARE(table, name, compat, fn, fn_type)			\
 	static const struct of_device_id __of_table_##name		\
···
 		     .data = (fn == (fn_type)NULL) ? fn : fn  }
 #else
 #define _OF_DECLARE(table, name, compat, fn, fn_type)			\
-	static const struct of_device_id __of_table_##name		\
-		__attribute__((unused))					\
-		 = { .compatible = compat,				\
-		     .data = (fn == (fn_type)NULL) ? fn : fn }
+	_OF_DECLARE_STUB(table, name, compat, fn, fn_type)
 #endif
 
 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);

include/linux/of_reserved_mem.h

···
 
 typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
 
+#ifdef CONFIG_OF_RESERVED_MEM
+
 #define RESERVEDMEM_OF_DECLARE(name, compat, init)			\
 	_OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
-
-#ifdef CONFIG_OF_RESERVED_MEM
 
 int of_reserved_mem_device_init_by_idx(struct device *dev,
 				       struct device_node *np, int idx);
···
 
 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
 #else
+
+#define RESERVEDMEM_OF_DECLARE(name, compat, init)			\
+	_OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
+
 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
 					struct device_node *np, int idx)
 {