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: I890335a0c0e31f7d3ea32c6130482e4ef0e20b88

src/com/android/settings/location/LocationEnabler.java

@@ -109,7 +109,7 @@ public class LocationEnabler implements LifecycleObserver, OnStart, OnStop {
 
         if (isRestricted()) {
             // Location toggling disabled by user restriction. Read the current location mode to
-            // update the location master switch.
+            // update the location primary switch.
             if (Log.isLoggable(TAG, Log.INFO)) {
                 Log.i(TAG, "Restricted user, not setting location mode");
             }

src/com/android/settings/location/LocationSettings.java

@@ -41,7 +41,7 @@ import java.util.List;
  * <ul>
  *     <li>Platform location controls</li>
  *     <ul>
- *         <li>In switch bar: location master switch. Used to toggle location on and off.
+ *         <li>In switch bar: location primary switch. Used to toggle location on and off.
  *         </li>
  *     </ul>
  *     <li>Recent location requests: automatically populated by {@link RecentLocationApps}</li>

src/com/android/settings/location/LocationSwitchBarController.java

@@ -60,9 +60,9 @@ public class LocationSwitchBarController implements SwitchBar.OnSwitchChangeList
 
     @Override
     public void onLocationModeChanged(int mode, boolean restricted) {
-        // Restricted user can't change the location mode, so disable the master switch. But in some
-        // corner cases, the location might still be enabled. In such case the master switch should
-        // be disabled but checked.
+        // Restricted user can't change the location mode, so disable the primary switch. But in
+        // some corner cases, the location might still be enabled. In such case the primary switch
+        // should be disabled but checked.
         final boolean enabled = mLocationEnabler.isEnabled(mode);
         final int userId = UserHandle.myUserId();
         final RestrictedLockUtils.EnforcedAdmin admin =
@@ -90,7 +90,7 @@ public class LocationSwitchBarController implements SwitchBar.OnSwitchChangeList
     }
 
     /**
-     * Listens to the state change of the location master switch.
+     * Listens to the state change of the location primary switch.
      */
     @Override
     public void onSwitchChanged(Switch switchView, boolean isChecked) {