AndroidBoot: Enable VB_ATTEST and OSVERSION flags

Add VB_ATTEST and OSEVERSION macros for EMMC target
compilation.

Change-Id: I8e286e1e04ea54c65db3755c9d03c398214693b5
diff --git a/AndroidBoot.mk b/AndroidBoot.mk
index 85c917d..f8fb87f 100644
--- a/AndroidBoot.mk
+++ b/AndroidBoot.mk
@@ -92,7 +92,7 @@
 
 # Top level for eMMC variant targets
 $(TARGET_EMMC_BOOTLOADER): emmc_appsbootldr_clean | $(EMMC_BOOTLOADER_OUT) $(INSTALLED_KEYSTOREIMAGE_TARGET)
-	$(MAKE) -C bootable/bootloader/lk TOOLCHAIN_PREFIX=$(CROSS_COMPILE) BOOTLOADER_OUT=../../../$(EMMC_BOOTLOADER_OUT) $(BOOTLOADER_PLATFORM) EMMC_BOOT=1 $(SIGNED_KERNEL) $(VERIFIED_BOOT) $(DEVICE_STATUS) $(BUILD_VARIANT) $(BOARD_NAME)
+	$(MAKE) -C bootable/bootloader/lk TOOLCHAIN_PREFIX=$(CROSS_COMPILE) BOOTLOADER_OUT=../../../$(EMMC_BOOTLOADER_OUT) $(BOOTLOADER_PLATFORM) EMMC_BOOT=1 $(SIGNED_KERNEL) $(VERIFIED_BOOT) $(DEVICE_STATUS) $(BUILD_VARIANT) $(BOARD_NAME) $(ENABLE_VB_ATTEST) $(OSVERSION_IN_BOOTIMAGE)
 
 # Keep build NAND & eMMC as default for targets still using TARGET_BOOTLOADER
 TARGET_BOOTLOADER := $(PRODUCT_OUT)/EMMCBOOT.MBN