Game Driver: Add settings global for prerelease driver opt in option

Bug: 134881329
Test: build, flash and boot
Change-Id: I8c3ba687f3c85f3fe093cdf7086adf9b8109713d
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 9d58464..e4c16b3 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -495,6 +495,7 @@
                     Settings.Global.GLOBAL_SETTINGS_ANGLE_WHITELIST,
                     Settings.Global.GAME_DRIVER_ALL_APPS,
                     Settings.Global.GAME_DRIVER_OPT_IN_APPS,
+                    Settings.Global.GAME_DRIVER_PRERELEASE_OPT_IN_APPS,
                     Settings.Global.GAME_DRIVER_OPT_OUT_APPS,
                     Settings.Global.GAME_DRIVER_BLACKLISTS,
                     Settings.Global.GAME_DRIVER_BLACKLIST,