Build hidden API DEX signatures with Soong

Internal master tree is still invoking Doclava with a Makefile build
rule for hidden API, while the remaining Doclava rules have been
migrated to Soong. Do the same for hidden API.

Test: make out/soong/.intermediates/frameworks/base/hiddenapi-lists/android_common/private-dex.txt
Merged-In: Ifa912f8751025b7de24a982a1a227a9c27d18267
Change-Id: Ifa912f8751025b7de24a982a1a227a9c27d18267
(cherry picked from commit 4f9d4d566c)

Android.mk

@@ -309,38 +309,6 @@ $(call dist-for-goals,sdk,$(INTERNAL_PLATFORM_API_FILE))
 $(call dist-for-goals,sdk,$(INTERNAL_PLATFORM_SYSTEM_API_FILE))
 $(call dist-for-goals,sdk,$(INTERNAL_PLATFORM_TEST_API_FILE))
 
-# ====  the complete hidden api list ===================================
-include $(CLEAR_VARS)
-
-LOCAL_SRC_FILES:=$(framework_docs_LOCAL_API_CHECK_SRC_FILES)
-LOCAL_GENERATED_SOURCES:=$(framework_docs_LOCAL_GENERATED_SOURCES)
-LOCAL_SRCJARS:=$(framework_docs_LOCAL_SRCJARS)
-LOCAL_JAVA_LIBRARIES:=$(framework_docs_LOCAL_API_CHECK_JAVA_LIBRARIES)
-LOCAL_MODULE_CLASS:=$(framework_docs_LOCAL_MODULE_CLASS)
-LOCAL_DROIDDOC_SOURCE_PATH:=$(framework_docs_LOCAL_DROIDDOC_SOURCE_PATH)
-LOCAL_DROIDDOC_HTML_DIR:=$(framework_docs_LOCAL_DROIDDOC_HTML_DIR)
-LOCAL_ADDITIONAL_JAVA_DIR:=$(framework_docs_LOCAL_API_CHECK_ADDITIONAL_JAVA_DIR)
-LOCAL_ADDITIONAL_DEPENDENCIES:=$(framework_docs_LOCAL_ADDITIONAL_DEPENDENCIES)
-
-LOCAL_MODULE := hidden-api-list
-
-LOCAL_DROIDDOC_OPTIONS:=\
-		$(framework_docs_LOCAL_DROIDDOC_OPTIONS) \
-		-referenceonly \
-		-showUnannotated \
-		-showAnnotation android.annotation.SystemApi \
-		-showAnnotation android.annotation.TestApi \
-		-privateDexApi $(INTERNAL_PLATFORM_PRIVATE_DEX_API_FILE) \
-		-nodocs
-
-LOCAL_DROIDDOC_CUSTOM_TEMPLATE_DIR:=external/doclava/res/assets/templates-sdk
-
-LOCAL_UNINSTALLABLE_MODULE := true
-
-include $(BUILD_DROIDDOC)
-
-$(full_target): .KATI_IMPLICIT_OUTPUTS := $(INTERNAL_PLATFORM_PRIVATE_DEX_API_FILE)
-
 # ====  check javadoc comments but don't generate docs ========
 include $(CLEAR_VARS)