Use standard lz4 format for Image.lz4 on ARM64

The lz4 Legacy format(which specified by -l) is
not supported by U-Boot.

Change-Id: I6b94881117b59384daca4efd796c933e8dc9e5a6
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>

Author: Andy Yan

arch/arm64/boot/Makefile

@@ -39,7 +39,7 @@ $(obj)/Image.gz: $(obj)/Image FORCE
 	$(call if_changed,gzip)
 
 $(obj)/Image.lz4: $(obj)/Image FORCE
-	$(call if_changed,lz4)
+	$(call if_changed,lz4c)
 
 $(obj)/Image.lzma: $(obj)/Image FORCE
 	$(call if_changed,lzma)

scripts/Makefile.lib

@@ -364,6 +364,11 @@ cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 	(rm -f $@ ; false)
 
+quiet_cmd_lz4c = LZ4C	$@
+cmd_lz4c = (cat $(filter-out FORCE,$^) | \
+	lz4c -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
+	(rm -f $@ ; false)
+
 # U-Boot mkimage
 # ---------------------------------------------------------------------------