Properly pre-grant notification permission

Android.bp

@@ -53,6 +53,7 @@ android_app {
     required: [
         "LocalContactsBackup",
         "com.stevesoltys.backup_allowlist",
+        "com.stevesoltys.backup_default-permissions",
         "com.stevesoltys.backup_privapp_allowlist"
     ],
     optimize: {
@@ -68,6 +69,14 @@ prebuilt_etc {
     filename_from_src: true,
 }
 
+prebuilt_etc {
+    name: "com.stevesoltys.backup_default-permissions",
+    system_ext_specific: true,
+    sub_dir: "default-permissions",
+    src: "default-permissions_com.stevesoltys.seedvault.xml",
+    filename_from_src: true,
+}
+
 prebuilt_etc {
     name: "com.stevesoltys.backup_privapp_allowlist",
     system_ext_specific: true,

default-permissions_com.stevesoltys.seedvault.xml

@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
+<exceptions>
+    <exception package="com.stevesoltys.seedvault">
+        <!-- Notifications -->
+        <permission name="android.permission.POST_NOTIFICATIONS" fixed="false"/>
+    </exception>
+</exceptions>

permissions_com.stevesoltys.seedvault.xml

@@ -7,6 +7,5 @@
         <permission name="android.permission.INTERACT_ACROSS_USERS_FULL"/>
         <permission name="android.permission.WRITE_SECURE_SETTINGS"/>
         <permission name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
-        <permission name="android.permission.POST_NOTIFICATIONS"/>
     </privapp-permissions>
 </permissions>