Fix kotlin nullable errors in Settings

Fix kotlin nullable errors that were exposed by setting the retention
of android.annotation.NonNull and android.annotation.Nullable to
class retention.

Bug: 294110802
Test: builds
Change-Id: I6aa0516fa4f6443b6d4dff873baf3b08ff9189f0
Merged-In: I6aa0516fa4f6443b6d4dff873baf3b08ff9189f0
(cherry picked from commit 84f8961e67d073bea2a1c146a219ff56fbfcf4fd)
diff --git a/src/com/android/settings/RegulatoryInfoDisplayActivity.kt b/src/com/android/settings/RegulatoryInfoDisplayActivity.kt
index ffacb9c..fdf66c3 100644
--- a/src/com/android/settings/RegulatoryInfoDisplayActivity.kt
+++ b/src/com/android/settings/RegulatoryInfoDisplayActivity.kt
@@ -46,7 +46,7 @@
 
         getRegulatoryInfo()?.let {
             val view = layoutInflater.inflate(R.layout.regulatory_info, null)
-            val image = view.findViewById<ImageView>(R.id.regulatoryInfo)
+            val image = view.requireViewById<ImageView>(R.id.regulatoryInfo)
             image.setImageDrawable(it)
             builder.setView(view)
             builder.show()