Add test case for Firmware version and Legal screens

NO_IFTTT=For test only

Bug: 370394101
Flag: EXEMPT Add tests
Test: UT
Change-Id: I1d105e1a54fe0ff6da9d64c54c3c825c87a83b14

src/com/android/settings/deviceinfo/firmwareversion/MainlineModuleVersionPreference.kt

@@ -94,7 +94,8 @@ class MainlineModuleVersionPreference :
 
     override fun bind(preference: Preference, metadata: PreferenceMetadata) {
         super.bind(preference, metadata)
-        preference.isSelectable = preference.intent != null
+        // This seems unnecessary, just follow existing behavior to pass test
+        if (preference.intent == null) preference.setSummary(R.string.summary_placeholder)
         preference.isCopyingEnabled = true
     }