bcm53xx: use otrx for creating TRX images

The advantage is that we don't have to specify max TRX size anymore and
otrx doesn't allocate a buffer of that size. It saves us allocating
32 MiB for every image we generate.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/bcm53xx/image/Makefile

@@ -59,9 +59,7 @@ define Build/trx
 endef
 
 define Build/trx-serial
-	$(STAGING_DIR_HOST)/bin/trx \
-		-o $@.new \
-		-m 33554432 \
+	$(STAGING_DIR_HOST)/bin/otrx create $@.new \
 		-f $(IMAGE_KERNEL) -a 1024 \
 		-f $@ -a 0x10000 -A $(KDIR)/fs_mark
 	mv $@.new $@
@@ -72,9 +70,7 @@ define Build/trx-nand
 	#	  if it grows up between releases
 	# root: UBI with one extra block containing UBI mark to trigger erasing
 	#	rest of partition
-	$(STAGING_DIR_HOST)/bin/trx \
-		-o $@.new \
-		-m 33554432 \
+	$(STAGING_DIR_HOST)/bin/otrx create $@.new \
 		-f $(IMAGE_KERNEL) -a 0x20000 -b 0x400000 \
 		-f $@ \
 		-A $(KDIR)/ubi_mark -a 0x20000