sepolicy: Use BOARD_VENDOR_SEPOLICY_DIRS

BOARD_SEPOLICY_DIRS is deprecated.

Signed-off-by: Felix <google@ix5.org>
Change-Id: Ic45c6692eff416a805f522fc7569d441c05e00cc
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 6e39bd2..7c168c7 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -25,7 +25,7 @@
 BOARD_AVB_ENABLE := true
 
 # sepolicy
-BOARD_SEPOLICY_DIRS += device/google/taimen/sepolicy
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/taimen/sepolicy
 
 ifeq (,$(filter-out taimen_gcc, $(TARGET_PRODUCT)))
 # if TARGET_PRODUCT == taimen_gcc