Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

Bug: 161896447
Test: robotest & manual
Change-Id: I1eaa45b576913e57ad9728e3a6fc892c4cf9fdc7

src/com/android/settings/fuelgauge/batterytip/tips/BatteryTip.java

@@ -138,7 +138,7 @@ public abstract class BatteryTip implements Comparable<BatteryTip>, Parcelable {
      * Check whether data is still make sense. If not, try recover.
      * @param context used to do validate check
      */
-    public void sanityCheck(Context context) {
+    public void validateCheck(Context context) {
         // do nothing
     }