[Catalyst] Fix restriction issue on sound settings

After ag/31443354, sliders on sound settings are not disabled when
"no_adjust_volume" restriction is set. The root cause is that
`SeekBarVolumizer.setSeekBar` updates the SeekBar enabled state.

Bug: 386162594
Flag: EXEMPT bugfix
Test: atest&manual
Change-Id: I5d37c9958a693a26717a8e2d9a62ec5ef225e28f

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

@@ -33,6 +33,7 @@ import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 
+import androidx.annotation.VisibleForTesting;
 import androidx.core.content.res.TypedArrayUtils;
 import androidx.preference.PreferenceViewHolder;
 
@@ -59,7 +60,8 @@ public class SeekBarPreference extends RestrictedPreference
     private int mHapticFeedbackMode = HAPTIC_FEEDBACK_MODE_NONE;
     private int mDefaultProgress = -1;
 
-    private SeekBar mSeekBar;
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    public SeekBar mSeekBar;
     private boolean mShouldBlink;
     private int mAccessibilityRangeInfoType = AccessibilityNodeInfo.RangeInfo.RANGE_TYPE_INT;
     private CharSequence mOverrideSeekBarStateDescription;