dm: remove pre reloc properties in SPL and TPL device tree

We can remove the pre reloc property in SPL and TPL device-tree:
- u-boot,dm-pre-reloc
- u-boot,dm-spl
- u-boot,dm-tpl
As only the needed node are kept by fdtgrep (1st pass).

The associated function (XXX_pre_reloc) are simple for SPL/TPL:
return always true.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 70de9bb..de67677 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -525,4 +525,5 @@
       cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
 		-n /chosen -n /config -O dtb | \
 	$(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
+		-P u-boot,dm-pre-reloc -P u-boot,dm-spl -P u-boot,dm-tpl \
 		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))