init: Separate the required modules of core and recovery variants

So that init_second_stage (core) depends on core variant tools and rc
files, and init_second_stage.recovery depends on recovery variant tools
and recovery specific rc files.

Bug: 191369319
Test: Presubmit
Test: Check the ninja graph, init_second_stage.recovery no longer depend
  on core variation modules
Test: Check out/soong/Android-${PRODUCT}.mk
Change-Id: I03f0cf6af10617fe2e7de677e9dde1aecb2afc74

init/Android.bp

@@ -228,17 +228,19 @@ cc_binary {
     stem: "init",
     defaults: ["init_defaults"],
     static_libs: ["libinit"],
-    required: [
-        "e2fsdroid",
-        "init.rc",
-        "mke2fs",
-        "sload_f2fs",
-        "make_f2fs",
-        "ueventd.rc",
-    ],
     srcs: ["main.cpp"],
     symlinks: ["ueventd"],
     target: {
+        platform: {
+            required: [
+                "init.rc",
+                "ueventd.rc",
+                "e2fsdroid",
+                "make_f2fs",
+                "mke2fs",
+                "sload_f2fs",
+            ],
+        },
         recovery: {
             cflags: ["-DRECOVERY"],
             exclude_static_libs: [
@@ -248,6 +250,14 @@ cc_binary {
                 "libbinder",
                 "libutils",
             ],
+            required: [
+                "init_recovery.rc",
+                "ueventd.rc.recovery",
+                "e2fsdroid.recovery",
+                "make_f2fs.recovery",
+                "mke2fs.recovery",
+                "sload_f2fs.recovery",
+            ],
         },
     },
     visibility: ["//packages/modules/Virtualization/microdroid"],