Add requested refresh rate on keyguard

Fixes: 184176119
Test: manual, atest SystemUITests
Change-Id: Ic3c1d3b47e9b3090afe042c72564ffc4bdda9199
diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index 2a1bee5..ea4d2fd 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -523,9 +523,13 @@
      -->
     <string name="config_rounded_mask" translatable="false">"M8,0C3.6,0,0,3.6,0,8"</string>
 
-    <!-- Preferred refresh rate at keyguard, if supported by the display -->
+    <!-- Preferred refresh rate at keyguard, if supported by the display. Overrides
+         keyguardMaxRefreshRate. -->
     <integer name="config_keyguardRefreshRate">-1</integer>
 
+    <!-- Preferred max refresh rate at keyguard, if supported by the display. -->
+    <integer name="config_keyguardMaxRefreshRate">-1</integer>
+
     <!-- Whether or not to add a "people" notifications section -->
     <bool name="config_usePeopleFiltering">false</bool>