Revert "fix(tftf): add pack_realm to all"

This reverts commit 910ad6433afe4c7549976ddf51311f59309831b9.

Change-Id: Ie470947e239614ac400e5c5ddff6ee0629658a4a
diff --git a/Makefile b/Makefile
index 29a92f6..4af1b2a 100644
--- a/Makefile
+++ b/Makefile
@@ -556,7 +556,6 @@
 	@echo "  PACK REALM PAYLOAD"
 	$(shell dd if=$(BUILD_PLAT)/realm.bin of=$(BUILD_PLAT)/tftf.bin obs=1 \
 	seek=$(TFTF_MAX_IMAGE_SIZE))
-all : pack_realm
 endif
 
 ifeq (${ARCH}-${PLAT},aarch64-tc0)