Remove unused mount modes and re-number the modes for consistency

Also, add REMOUNT_MODE_ANDROID_WRITABLE to return "/mnt/runtime/write".

Bug: 148454884
Test: builds
Change-Id: I5a38c88f46034c494604bb001cf4d4c400c8f73e
diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 24a3b38..fd134c5 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -174,13 +174,9 @@
 
     const int REMOUNT_MODE_NONE = 0;
     const int REMOUNT_MODE_DEFAULT = 1;
-    const int REMOUNT_MODE_READ = 2;
-    const int REMOUNT_MODE_WRITE = 3;
-    const int REMOUNT_MODE_LEGACY = 4;
-    const int REMOUNT_MODE_INSTALLER = 5;
-    const int REMOUNT_MODE_FULL = 6;
-    const int REMOUNT_MODE_PASS_THROUGH = 7;
-    const int REMOUNT_MODE_ANDROID_WRITABLE = 8;
+    const int REMOUNT_MODE_INSTALLER = 2;
+    const int REMOUNT_MODE_PASS_THROUGH = 3;
+    const int REMOUNT_MODE_ANDROID_WRITABLE = 4;
 
     const int VOLUME_STATE_UNMOUNTED = 0;
     const int VOLUME_STATE_CHECKING = 1;