makefile: Add VB ATTEST and OSVERSION IN BOOTIMAGE flags

VB ATTEST flag is needed for latest version of verified boot
and OSVERSION IN BOOTIMAGE is needed for storing os version
in bootimage header structure.

Change-Id: I3b6d09786f8c1071f6fcf9cc4bdbddbfa8923f70
diff --git a/makefile b/makefile
index 542bfaf..277a714 100644
--- a/makefile
+++ b/makefile
@@ -105,6 +105,14 @@
   endif
 endif
 
+ifeq ($(OSVERSION_IN_BOOTIMAGE),1)
+ DEFINES += OSVERSION_IN_BOOTIMAGE=1
+endif
+
+ifeq ($(ENABLE_VB_ATTEST),1)
+ DEFINES += ENABLE_VB_ATTEST=1
+endif
+
 ifeq ($(USER_BUILD_VARIANT),true)
   DEFINES += USER_BUILD_VARIANT=1
 endif