Replace framework.jar with framework-minus-apex.jar

framework.jar is now a build-time only library which has private symbols
from framework-minus-apex.jar and public symbols from APEXes. Instead of
framework.jar, framework-minus-apex.jar is installed to the device.

framework-minus-apex is installed as framework.jar because the name is
pretty widespread throughout Android. Keeping the original file name for
the backwards compatibility.

Bug: 139391334
Test: m, inspect the build system.img and check that
system/framework/framework.jar exists
Change-Id: Ia12d5984b011a54bd8ef708d0f552298a6ddec8a

Android.bp

@@ -402,22 +402,35 @@ java_library {
     name: "framework-minus-apex",
     defaults: ["framework-defaults"],
     srcs: [":framework-non-updatable-sources"],
+    installable: true,
     javac_shard_size: 150,
+    required: [
+        "framework-platform-compat-config",
+        "libcore-platform-compat-config",
+        "services-platform-compat-config",
+        "media-provider-platform-compat-config",
+        "services-devicepolicy-platform-compat-config",
+    ],
+    // For backwards compatibility.
+    stem: "framework",
 }
 
+// This "framework" module is NOT installed to the device. It's
+// "framework-minus-apex" that gets installed to the device. Note that
+// the filename is still framework.jar (via the stem property) for
+// compatibility reason. The purpose of this module is to provide
+// framework APIs (both public and private) for bundled apps.
+// "framework-minus-apex" can't be used for the purpose because 1)
+// many apps have already hardcoded the name "framework" and
+// 2) it lacks API symbols from updatable modules - as it's clear from
+// its suffix "-minus-apex".
 java_library {
     name: "framework",
     defaults: ["framework-aidl-export-defaults"],
-    installable: true,
+    installable: false, // this lib is a build-only library
     static_libs: [
         "framework-minus-apex",
-    ],
-    required: [
-        "framework-platform-compat-config",
-        "libcore-platform-compat-config",
-        "services-platform-compat-config",
-        "media-provider-platform-compat-config",
-        "services-devicepolicy-platform-compat-config",
+        // TODO(jiyong): add stubs for APEXes here
     ],
     sdk_version: "core_platform",
 }