Revert^2 "Nullability Annotations replacement"

This reverts commit 19d1d3d15d.

Reason for revert: revert it because this is not the root cause.

bug: 316867690
Change-Id: I0f168dbb64044aa720202af7b1040afd4f028c9c

src/com/android/settings/connecteddevice/fastpair/FastPairDeviceUpdater.java

@@ -16,9 +16,10 @@
 
 package com.android.settings.connecteddevice.fastpair;
 
-import android.annotation.Nullable;
 import android.content.Context;
 
+import androidx.annotation.Nullable;
+
 /**
  * Updates the Fast Pair devices. It notifies the upper level whether to add/remove the preference
  * through {@link DevicePreferenceCallback}