Add READ_DREAM_STATE to the settings list

Settings application needs the previleged permission to
get AoD supression status by using PowerManager API

Bug: 173425264
Change-Id: I5da006b7c88dc36d3eefebc559f2a2f3ab50823f
Test: Manual & bootup device

data/etc/com.android.settings.xml

@@ -56,5 +56,7 @@
         <permission name="android.permission.WRITE_SECURE_SETTINGS"/>
         <permission name="android.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS" />
         <permission name="android.permission.INSTALL_DYNAMIC_SYSTEM"/>
+        <permission name="android.permission.READ_DREAM_STATE"/>
+        <permission name="android.permission.READ_DREAM_SUPPRESSION"/>
     </privapp-permissions>
 </permissions>