Adds the validator adaptive_sleep back to SystemSettingsValidators

Test: atest SettingsProviderTest
BUG: 149476174

Change-Id: Ic744181383c79220f5cfa127d96b387fcf9ecba9
diff --git a/packages/SettingsProvider/src/android/provider/settings/validators/SystemSettingsValidators.java b/packages/SettingsProvider/src/android/provider/settings/validators/SystemSettingsValidators.java
index 8037266..c5d4fa9 100644
--- a/packages/SettingsProvider/src/android/provider/settings/validators/SystemSettingsValidators.java
+++ b/packages/SettingsProvider/src/android/provider/settings/validators/SystemSettingsValidators.java
@@ -126,6 +126,7 @@
         VALIDATORS.put(System.SCREEN_OFF_TIMEOUT, NON_NEGATIVE_INTEGER_VALIDATOR);
         VALIDATORS.put(System.SCREEN_BRIGHTNESS_FOR_VR, new InclusiveIntegerRangeValidator(0, 255));
         VALIDATORS.put(System.SCREEN_BRIGHTNESS_MODE, BOOLEAN_VALIDATOR);
+        VALIDATORS.put(System.ADAPTIVE_SLEEP, BOOLEAN_VALIDATOR);
         VALIDATORS.put(System.MODE_RINGER_STREAMS_AFFECTED, NON_NEGATIVE_INTEGER_VALIDATOR);
         VALIDATORS.put(System.MUTE_STREAMS_AFFECTED, NON_NEGATIVE_INTEGER_VALIDATOR);
         VALIDATORS.put(System.VIBRATE_ON, BOOLEAN_VALIDATOR);