dtoc: Rename the auto-generated dt-structs.h file

The filename of the auto-generated file is the same as the file that
includes it. Even though the form is in the generated/ subdirectory, this
could be confused.

Rename the generated file to something that makes it clear it is
auto-generated.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Kever Yang <kever.yang@rock-chips.com>

include/dt-structs.h

@@ -23,7 +23,7 @@ struct phandle_2_arg {
 	const void *node;
 	int arg[2];
 };
-#include <generated/dt-structs.h>
+#include <generated/dt-structs-gen.h>
 #endif
 
 #endif

scripts/Makefile.spl

@@ -257,14 +257,15 @@ cmd_dtoch = $(pythonpath) $(srctree)/tools/dtoc/dtoc -d $(obj)/$(SPL_BIN).dtb -o
 quiet_cmd_plat = PLAT    $@
 cmd_plat = $(CC) $(c_flags) -c $< -o $@
 
-$(obj)/dts/dt-platdata.o: $(obj)/dts/dt-platdata.c include/generated/dt-structs.h
+$(obj)/dts/dt-platdata.o: $(obj)/dts/dt-platdata.c \
+		include/generated/dt-structs-gen.h
 	$(call if_changed,plat)
 
 PHONY += dts_dir
 dts_dir:
 	$(shell [ -d $(obj)/dts ] || mkdir -p $(obj)/dts)
 
-include/generated/dt-structs.h: $(obj)/$(SPL_BIN).dtb dts_dir checkdtoc
+include/generated/dt-structs-gen.h: $(obj)/$(SPL_BIN).dtb dts_dir checkdtoc
 	$(call if_changed,dtoch)
 
 $(obj)/dts/dt-platdata.c: $(obj)/$(SPL_BIN).dtb dts_dir checkdtoc