make: Enable kernel authentication for LE

Enable VERIFIED_BOOT for LE targets if VERIFIED_BOOT_LE flag is
set on recipes.

Change-Id: Id06719d4409f8c0021d6e134dcefa0eefe96135e
diff --git a/makefile b/makefile
index 0b3237c..f4e7c19 100644
--- a/makefile
+++ b/makefile
@@ -116,6 +116,13 @@
   endif
 endif
 
+ifeq ($(VERIFIED_BOOT_LE),1)
+  DEFINES += VERIFIED_BOOT_LE=1
+  ifeq ($(DEFAULT_UNLOCK),true)
+    DEFINES += DEFAULT_UNLOCK=1
+  endif
+endif
+
 ifeq ($(OSVERSION_IN_BOOTIMAGE),1)
  DEFINES += OSVERSION_IN_BOOTIMAGE=1
 endif