Reapply "kbuild: split device tree build rules into scripts/Makefile.dtbs"

This reverts commit 245273f9bf.

Reason of revert: rockpi is fixed in changes in the same topic.

Bug: 371628764
Change-Id: I8ace1428d89bd02c861bf9ebb0242cde8bd5441a
Signed-off-by: HONG Yifan <elsk@google.com>

drivers/of/fdt.c

@@ -34,7 +34,7 @@
 
 /*
  * __dtb_empty_root_begin[] and __dtb_empty_root_end[] magically created by
- * cmd_dt_S_dtb in scripts/Makefile.lib
+ * cmd_wrap_S_dtb in scripts/Makefile.dtbs
  */
 extern uint8_t __dtb_empty_root_begin[];
 extern uint8_t __dtb_empty_root_end[];

drivers/of/unittest.c

@@ -1861,7 +1861,7 @@ static int __init unittest_data_add(void)
 	struct device_node *unittest_data_node = NULL, *np;
 	/*
 	 * __dtbo_testcases_begin[] and __dtbo_testcases_end[] are magically
-	 * created by cmd_dt_S_dtbo in scripts/Makefile.lib
+	 * created by cmd_wrap_S_dtbo in scripts/Makefile.dtbs
 	 */
 	extern uint8_t __dtbo_testcases_begin[];
 	extern uint8_t __dtbo_testcases_end[];
@@ -3525,7 +3525,7 @@ out_skip_tests:
 
 /*
  * __dtbo_##overlay_name##_begin[] and __dtbo_##overlay_name##_end[] are
- * created by cmd_dt_S_dtbo in scripts/Makefile.lib
+ * created by cmd_wrap_S_dtbo in scripts/Makefile.dtbs
  */
 
 #define OVERLAY_INFO_EXTERN(overlay_name) \