Remove dependency on marlin sepolicy

Now that the selinux policy has been split between the system and
vendor partitions the aosp_arm64_ab build variant no longer
depends on the marlin selinux policy to work on marlin and sailfish.

Test: build and flash aosp_arm64_ab system.img on marlin and sailfish
Change-Id: I7681207284d783ffca1acccf44dbb159ea3b521c

target/board/generic_arm64_ab/BoardConfig.mk

@@ -47,8 +47,6 @@ TARGET_COPY_OUT_VENDOR := vendor
 # Generic AOSP image does NOT support HWC1
 TARGET_USES_HWC2 := true
 
-BOARD_SEPOLICY_DIRS += build/target/board/generic/sepolicy
-
 # TODO(jiyong): Remove these two. These are required in order to remove
 # board-specific sysprops from system.img. This should be replaced with
 # a more meaningful build flags such as BOARD_SYSPROP_SPLIT.

target/product/aosp_arm64_ab.mk

@@ -45,6 +45,9 @@ PRODUCT_COPY_FILES += \
 PRODUCT_PACKAGE_OVERLAYS := \
     device/google/marlin/overlay
 
+#split selinux policy
+PRODUCT_FULL_TREBLE_OVERRIDE := true
+
 # Some of HAL interface libraries are automatically added by the dependencies from
 # the framework. However, we list them all here to make it explicit and prevent
 # possible mistake.