Remove the getSwitch() in SwitchWidgetController

IMHO we don't need to expose switch in SwitchWidgetController.
This controller already has enough API to control the switch.

Also rename mSwitchWidget to mSwitchController because it is not a
widget.

Bug: 69973752
Test: test still pass
Change-Id: I0ac247e34468a44109ab26019f1303c814e381f2

src/com/android/settings/widget/SwitchWidgetController.java

@@ -16,7 +16,6 @@
 
 package com.android.settings.widget;
 
-import android.widget.Switch;
 import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
 
 /*
@@ -108,12 +107,4 @@ public abstract class SwitchWidgetController {
      * is {@code null}, then this preference will be enabled. Otherwise, it will be disabled.
      */
     public abstract void setDisabledByAdmin(EnforcedAdmin admin);
-
-    /**
-     * Get the underlying switch widget.
-     *
-     * @return the switch widget.
-     */
-    public abstract Switch getSwitch();
-
 }