Implement sysprop_library API stability check

sysprop_library now checks the API stability itself, cutting dependency
on java_sdk_library. Under the directory {module_dir}/api,
{module_name}-current.txt and {module_name}-latest.txt hold API
signatures.

When sysprop_library is built, or a user run "m {module_name}-check-api"
command, API check is performed. First, current.txt must have exactly
same signature with built sysprop_library module. Second, current.txt
must be compatible with latest.txt.

Build system emits a handy error message to generate/update those API
files, in case of missing or mismatching. Also, a script file for
freezing API files is introduced.

Bug: 131637873
Test: 1) m && boot blueline
Test: 2) m {sysprop_library} performs API check
Test: 3) manual test for check-api, freezing api
Change-Id: I6d69fb418bac675bbb9e4ac25c3269dfa3029219
Merged-In: I6d69fb418bac675bbb9e4ac25c3269dfa3029219
(cherry picked from commit 4fe9f0f8fd)

Android.bp

@@ -102,10 +102,8 @@ framework_srcs = [
 
     // etc.
     "core/java/**/*.logtags",
-    ":apex-properties",
     ":framework-javastream-protos",
     ":framework-statslog-gen",
-    ":platform-properties",
 ]
 
 framework_aidl_local_include_dirs = [
@@ -208,6 +206,9 @@ java_defaults {
         "android.hardware.vibrator-V1.3-java",
         "android.hardware.wifi-V1.0-java-constants",
         "devicepolicyprotosnano",
+
+        "com.android.sysprop.apex",
+        "PlatformProperties",
     ],
 
     required: [