Fwk matrix use PLATFORM_SEPOLICY_*

It used BOARD_SEPOLICY_VERS as a workaround, which is incorrect.

Test: m framework_compatibility_matrix.xml -j
Bug: 67920434
Change-Id: I029edd2f573740af272f8b767bb1ec5cc1dc0415
diff --git a/compatibility_matrices/Android.mk b/compatibility_matrices/Android.mk
index 1c86f11..71253da 100644
--- a/compatibility_matrices/Android.mk
+++ b/compatibility_matrices/Android.mk
@@ -61,8 +61,9 @@
 LOCAL_SRC_FILES := $(LOCAL_MODULE_STEM)
 LOCAL_ADD_VBMETA_VERSION := true
 LOCAL_ASSEMBLE_VINTF_ENV_VARS := \
-	POLICYVERS \
-	BOARD_SEPOLICY_VERS
+    POLICYVERS \
+    PLATFORM_SEPOLICY_VERSION \
+    PLATFORM_SEPOLICY_COMPAT_VERSIONS
 
 include $(BUILD_FRAMEWORK_COMPATIBILITY_MATRIX)