STOPSHIP: Roll forward: Add UidCpuPower global setting

This will help us run P/H experiments by controlling the
uid cpu power system property through P/H.

b/70517018
Test: adb shell settings put global sys_uidcpupower 1
      verify via getprop sys.uidcpupower

Change-Id: I8cf7365be885ef4910e37d3f993ba3079e15a37d
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 5bb9abe..26e68f1 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -374,6 +374,7 @@
                     Settings.Global.SYS_STORAGE_THRESHOLD_MAX_BYTES,
                     Settings.Global.SYS_STORAGE_THRESHOLD_PERCENTAGE,
                     Settings.Global.SYS_VDSO,
+                    Settings.Global.SYS_UIDCPUPOWER,
                     Settings.Global.FPS_DEVISOR,
                     Settings.Global.TCP_DEFAULT_INIT_RWND,
                     Settings.Global.TETHER_DUN_APN,