android: add apex makefile for vulkan

* Based on cuttlefish implementation [1].
* Unfortunately EGL drivers can't be packaged into APEX as the loader [2]
  doesn't support it unlike the vulkan loader [3] that does.

[1]: https://android.googlesource.com/device/google/cuttlefish/+/refs/tags/android-16.0.0_r1/guest/hals/vulkan/
[2]: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-16.0.0_r1/opengl/libs/EGL/Loader.cpp
[3]: https://android.googlesource.com/platform/frameworks/native/+/refs/tags/android-16.0.0_r1/vulkan/libvulkan/driver.cpp

Android.bp

@@ -1795,8 +1795,7 @@ cc_library_shared {
 }
 
 cc_library_shared {
-    name: "vulkan_panfrost",
-    stem: "vulkan.panfrost",
+    name: "vulkan.panfrost",
     srcs: [
         "src/panfrost/vulkan/panvk_android.c",
         "src/panfrost/vulkan/panvk_buffer.c",
@@ -1922,6 +1921,7 @@ cc_library_shared {
         "meson_generated/src/vulkan/util",
         "meson_generated/src/vulkan/wsi",
     ],
+    soc_specific: true,
     relative_install_path: "hw",
     afdo: true,
     defaults: ["mesa3d-desktop-panvk-defaults"],

apex/Android.bp

@@ -0,0 +1,36 @@
+//
+// Copyright (C) 2025 Venkata Atchuta Bheemeswara Sarma Darbha
+// Copyright (C) 2025 KonstaKANG
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+linker_config {
+    name: "android.hardware.vulkan.panfrost-linker-config",
+    src: "apex_linkerconfig.json",
+    installable: false,
+}
+
+prebuilt_etc {
+    name: "android.hardware.vulkan.panfrost.rc",
+    src: "android.hardware.vulkan.panfrost.rc",
+    installable: false,
+}
+
+apex {
+    name: "com.android.hardware.vulkan.panfrost",
+    manifest: "apex_manifest.json",
+    file_contexts: "apex_file_contexts",
+    key: "com.android.hardware.key",
+    certificate: ":com.android.hardware.certificate",
+    updatable: false,
+    vendor: true,
+
+    prebuilts: [
+        "android.hardware.vulkan.panfrost-linker-config",
+        "android.hardware.vulkan.panfrost.rc",
+    ],
+    native_shared_libs: [
+        "vulkan.panfrost",
+    ],
+}

apex/android.hardware.vulkan.panfrost.rc

@@ -0,0 +1,6 @@
+# `on init` is normally not available for .rc files in vendor apexes
+# But the vulkan apex is okay because it's bootstrap APEX.
+# For bootstrap APEXes, `on init` is the earliest available trigger.
+on init
+    setprop ro.hardware.vulkan panfrost
+    setprop ro.vulkan.apex com.android.hardware.vulkan.panfrost

apex/apex_file_contexts

@@ -0,0 +1,4 @@
+(/.*)?                 u:object_r:vendor_file:s0
+/etc(/.*)?             u:object_r:vendor_configs_file:s0
+/etc/linker.config.pb  u:object_r:linkerconfig_file:s0
+/lib64(/.*)?           u:object_r:same_process_hal_file:s0

apex/apex_linkerconfig.json

@@ -0,0 +1,4 @@
+{
+  // visible so that vulkan loader can see
+  "visible": true
+}

apex/apex_manifest.json

@@ -0,0 +1,5 @@
+{
+    "name": "com.android.hardware.vulkan.panfrost",
+    "version": 1,
+    "vendorBootstrap": true
+}