bluetooth: convert to apex

* Use device as an identifier in package names so APEXs on rpi4/rpi5 trees
  can co-exist. Somehow apex definitions escape the soong namespace. It
  doesn't complain about duplicate package names but dependecies later in
  the build after analyzing Android.bp files and generating ninja file.
  FAILED: ninja: ... multiple rules generate com.android.hardware.bluetooth.rpi-deps-info [-w dupbuild=err]
  https://android.googlesource.com/platform/build/soong/+/refs/heads/main/README.md#namespaces
* Not sure if this is an AOSP bug or intended behaviour for apex targets.
  Don't like using the rpi4/rpi5 tags but couldn't come up with better
  solution to limit the visibility that worked.
* General cleanups. As APEX package contains all dependencies that are
  needed for the service, remove unused shared libraries.
  Run 'bpfmt -s -w Android.bp'.

bluetooth/Android.bp

@@ -6,28 +6,51 @@
 cc_binary {
     name: "android.hardware.bluetooth-service.rpi",
     relative_install_path: "hw",
-    init_rc: ["bluetooth-service-rpi.rc"],
-    vintf_fragments: ["bluetooth-service-rpi.xml"],
     vendor: true,
-    cflags: [
-        "-Wall",
-        "-Wextra",
-    ],
     srcs: [
         "BluetoothHci.cpp",
+        "main.cpp",
         "net_bluetooth_mgmt.cpp",
-        "service.cpp",
-    ],
-    shared_libs: [
-        "android.hardware.bluetooth-V1-ndk",
-        "libbase",
-        "libbinder_ndk",
-        "libhidlbase",
-        "liblog",
-        "libutils",
     ],
     static_libs: [
         "android.hardware.bluetooth.async",
         "android.hardware.bluetooth.hci",
     ],
+    shared_libs: [
+        "android.hardware.bluetooth-V1-ndk",
+        "libbase",
+        "libbinder_ndk",
+        "liblog",
+        "libutils",
+    ],
+    installable: false,
+}
+
+prebuilt_etc {
+    name: "android.hardware.bluetooth-service.rpi.rc",
+    src: "android.hardware.bluetooth-service.rpi.rc",
+    installable: false,
+}
+
+prebuilt_etc {
+    name: "android.hardware.bluetooth-service.rpi.xml",
+    src: "android.hardware.bluetooth-service.rpi.xml",
+    sub_dir: "vintf",
+    installable: false,
+}
+
+apex {
+    name: "com.android.hardware.bluetooth.rpi4",
+    manifest: "apex_manifest.json",
+    file_contexts: "apex_file_contexts",
+    key: "com.android.hardware.key",
+    certificate: ":com.android.hardware.certificate",
+    updatable: false,
+    vendor: true,
+
+    binaries: ["android.hardware.bluetooth-service.rpi"],
+    prebuilts: [
+        "android.hardware.bluetooth-service.rpi.rc",
+        "android.hardware.bluetooth-service.rpi.xml",
+    ],
 }