floral: add Files app to high refresh rate exception list

Bug: 141882818
Test: adb shell dumpsys window refresh
Test: adb shell dumpsys display (When Files app is foreground)
Change-Id: Ia904bfedb920839b18d3e9209d81636dd139d5f4
(cherry picked from commit 91479eee3ab3d2ec4fe92b1596a52f2bf1888932)
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index da39fbf..4bcfe27 100755
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -604,6 +604,7 @@
         <item>com.nianticlabs.pokemongo</item>
         <item>com.waze</item>
         <item>com.tencent.mm</item>
+        <item>com.google.android.documentsui</item>
     </string-array>
 
     <!-- Disable AOD by default -->