sepolicy_vndr: Switch to SYSTEM_EXT_{PUBLIC,PRIVATE}_SEPOLICY_DIRS

Fixes:
warning: BOARD_PLAT_PRIVATE_SEPOLICY_DIR has been deprecated.
    Use SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS instead.
warning: BOARD_PLAT_PUBLIC_SEPOLICY_DIR has been deprecated.
    Use SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS instead.
Change-Id: I752602079de8ff4c5370fe3ec861b8746838d878
diff --git a/SEPolicy.mk b/SEPolicy.mk
index 277e7c8..d7703da 100644
--- a/SEPolicy.mk
+++ b/SEPolicy.mk
@@ -4,22 +4,22 @@
 BOARD_SYSTEM_EXT_PREBUILT_DIR := device/qcom/sepolicy/generic
 BOARD_PRODUCT_PREBUILT_DIR := device/qcom/sepolicy/generic/product
 SYS_ATTR_PROJECT_PATH := $(TOP)/device/qcom/sepolicy/generic/public/attribute
-BOARD_PLAT_PUBLIC_SEPOLICY_DIR := \
-    $(BOARD_PLAT_PUBLIC_SEPOLICY_DIR) \
+SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS := \
+    $(SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS) \
     $(QSSI_SEPOLICY_PATH)/generic/public \
     $(QSSI_SEPOLICY_PATH)/generic/public/attribute
 
-BOARD_PLAT_PRIVATE_SEPOLICY_DIR := \
-    $(BOARD_PLAT_PRIVATE_SEPOLICY_DIR) \
+SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS := \
+    $(SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS) \
     $(QSSI_SEPOLICY_PATH)/generic/private
 
-BOARD_PLAT_PUBLIC_SEPOLICY_DIR := \
-    $(BOARD_PLAT_PUBLIC_SEPOLICY_DIR) \
+SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS := \
+    $(SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS) \
     $(QSSI_SEPOLICY_PATH)/qva/public \
     $(QSSI_SEPOLICY_PATH)/qva/public/attribute
 
-BOARD_PLAT_PRIVATE_SEPOLICY_DIR := \
-    $(BOARD_PLAT_PRIVATE_SEPOLICY_DIR) \
+SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS := \
+    $(SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS) \
     $(QSSI_SEPOLICY_PATH)/qva/private
 
 #once all the services are moved to Product /ODM above lines will be removed.