Add boot slot support

Change-Id: I7eaf80e327985f53791f90fbdebad022a9650d31
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index a81781b..390c3f1 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -177,6 +177,12 @@
         RELINK_SOURCE_FILES += $(TARGET_OUT_VENDOR_SHARED_LIBRARIES)/libcryptfs_hw.so
     endif
 endif
+ifeq ($(AB_OTA_UPDATER), true)
+    RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/bootctl
+    ifneq ($(TW_INCLUDE_CRYPTO), true)
+        RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libhardware.so
+    endif
+endif
 ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
     RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/make_ext4fs
 endif