Convert init_vendor to Android.bp

`init_first_stage` is a dependency of `init_vendor` only when
`BOARD_USES_RECOVERY_AS_BOOT` is false.
Since `BOARD_USES_RECOVERY_AS_BOOT` is already defined in
`build/make/core/android_soong_config_vars.mk` within a
soong_namespace, we can use the `soong_config_module_type` to easily
convert this to Android.bp.

Bug: 347600829
Test: m init_vendor
Change-Id: I1ddcd5fb62983b01e51452c9b7367750e03e7f48

init/Android.bp

@@ -162,7 +162,7 @@ libinit_cc_defaults {
         },
         release_write_appcompat_override_system_properties: {
             cflags: ["-DWRITE_APPCOMPAT_OVERRIDE_SYSTEM_PROPERTIES"],
-        }
+        },
     },
     static_libs: [
         "libavb",
@@ -663,3 +663,23 @@ sh_binary {
     src: "extra_free_kbytes.sh",
     filename_from_src: true,
 }
+
+soong_config_module_type {
+    name: "board_use_recovery_as_boot_phony",
+    module_type: "phony",
+    config_namespace: "ANDROID",
+    bool_variables: ["BOARD_USES_RECOVERY_AS_BOOT"],
+    properties: ["required"],
+}
+
+board_use_recovery_as_boot_phony {
+    name: "init_vendor",
+    soong_config_variables: {
+        BOARD_USES_RECOVERY_AS_BOOT: {
+            required: [],
+            conditions_default: {
+                required: ["init_first_stage"],
+            },
+        },
+    },
+}

init/Android.mk

@@ -1,16 +0,0 @@
-# Copyright 2005 The Android Open Source Project
-
-LOCAL_PATH:= $(call my-dir)
-
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := init_vendor
-LOCAL_LICENSE_KINDS := SPDX-license-identifier-Apache-2.0
-LOCAL_LICENSE_CONDITIONS := notice
-LOCAL_NOTICE_FILE := $(LOCAL_PATH)/NOTICE
-ifneq ($(BOARD_USES_RECOVERY_AS_BOOT),true)
-LOCAL_REQUIRED_MODULES := \
-   init_first_stage \
-
-endif  # BOARD_USES_RECOVERY_AS_BOOT
-include $(BUILD_PHONY_PACKAGE)