Add missing mediatek gralloc4 init .rc file

The gbm_mesa cherry-pick series added a mediatek gralloc@4.0 service
definition but the corresponding init .rc file was missing from the
aosp/android-16.0_r3 branch. Create it from the msm template.

Copyright (C) 2026 Brendan Szymanski <hello@bscubed.dev>

cros_gralloc/gralloc4/android.hardware.graphics.allocator@4.0-service.minigbm_mediatek.rc

@@ -0,0 +1,24 @@
+#
+# Copyright 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+service vendor.graphics.allocator-4-0 /vendor/bin/hw/android.hardware.graphics.allocator@4.0-service.minigbm_mediatek
+    interface android.hardware.graphics.allocator@4.0::IAllocator default
+    class hal animation
+    user system
+    group graphics drmrpc
+    capabilities SYS_NICE
+    onrestart restart surfaceflinger
+    task_profiles ServiceCapacityLow