Remove BOARD_SEPOLICY_VERS_DIR build variable.

The original purpose of BOARD_SEPOLICY_VERS_DIR was to allow the
specification of an alternate platform public policy, primarily for
testing purposes.  This should not be a part of the released platform,
since the only public policy and corresponding mapping file construction
should be based on the current public platform policy, with compatibility
with vendor policy targeting previous versions provided by static mapping
files.  Its continued presence muddles the generation of mapping files by
potentially introducing a situation in which an incorrect mapping file is
generated.  Remove it.

Bug: 36783775
Test: Device boots with compiled SELinux policy (SHA256s don't match for
precompiled policy).

Change-Id: I9e2100a7d709c9c0949f4e556229623961291a32

Android.mk

@@ -89,20 +89,10 @@ REQD_MASK_POLICY := $(LOCAL_PATH)/reqd_mask
 # version identifier corresponding to the sepolicy on which the non-platform
 # policy is to be based. If unspecified, this will build against the current
 # public platform policy in tree
-# BOARD_SEPOLICY_VERS_DIR should contain the public platform policy which
-#  is associated with the given BOARD_SEPOLICY_VERS.  The policy therein will be
-#  versioned according to the BOARD_SEPOLICY_VERS identifier and included as
-#  part of the non-platform policy to ensure removal of access in future
-#  platform policy does not break non-platform policy.
 ifndef BOARD_SEPOLICY_VERS
 $(warning BOARD_SEPOLICY_VERS not specified, assuming current platform version)
 # The default platform policy version.
 BOARD_SEPOLICY_VERS := $(PLATFORM_SEPOLICY_VERSION)
-BOARD_SEPOLICY_VERS_DIR := $(PLAT_PUBLIC_POLICY)
-else
-ifndef BOARD_SEPOLICY_VERS_DIR
-$(error BOARD_SEPOLICY_VERS_DIR not specified for versioned sepolicy.)
-endif
 endif
 
 ###########################################################
@@ -246,7 +236,7 @@ $(plat_pub_policy.conf): PRIVATE_TGT_ARCH := $(my_target_arch)
 $(plat_pub_policy.conf): PRIVATE_TGT_WITH_ASAN := $(with_asan)
 $(plat_pub_policy.conf): PRIVATE_ADDITIONAL_M4DEFS := $(LOCAL_ADDITIONAL_M4DEFS)
 $(plat_pub_policy.conf): $(call build_policy, $(sepolicy_build_files), \
-$(BOARD_SEPOLICY_VERS_DIR) $(REQD_MASK_POLICY))
+$(PLAT_PUBLIC_POLICY) $(REQD_MASK_POLICY))
 	@mkdir -p $(dir $@)
 	 $(hide) m4 $(PRIVATE_ADDITIONAL_M4DEFS) \
 		-D mls_num_sens=$(PRIVATE_MLS_SENS) -D mls_num_cats=$(PRIVATE_MLS_CATS) \
@@ -422,7 +412,7 @@ $(nonplat_policy.conf): PRIVATE_TGT_ARCH := $(my_target_arch)
 $(nonplat_policy.conf): PRIVATE_TGT_WITH_ASAN := $(with_asan)
 $(nonplat_policy.conf): PRIVATE_ADDITIONAL_M4DEFS := $(LOCAL_ADDITIONAL_M4DEFS)
 $(nonplat_policy.conf): $(call build_policy, $(sepolicy_build_files), \
-$(BOARD_SEPOLICY_VERS_DIR) $(REQD_MASK_POLICY) $(PLAT_VENDOR_POLICY) $(BOARD_SEPOLICY_DIRS))
+$(PLAT_PUBLIC_POLICY) $(REQD_MASK_POLICY) $(PLAT_VENDOR_POLICY) $(BOARD_SEPOLICY_DIRS))
 	@mkdir -p $(dir $@)
 	$(hide) m4 $(PRIVATE_ADDITIONAL_M4DEFS) \
 		-D mls_num_sens=$(PRIVATE_MLS_SENS) -D mls_num_cats=$(PRIVATE_MLS_CATS) \