Force Software Rendering for KeyguardClockFrame

Using hardware rendering disables the ability to intercept alpha
and handle it seperately. Enforcing a software layer for the view
in question prevents this from happening.

Bug: 288233136
Test: Manually tested the new setting
Change-Id: I8e1ea0769bdba27e880eea642176fdd2c25bfca4

packages/SystemUI/src/com/android/keyguard/KeyguardClockFrame.kt

@@ -12,6 +12,10 @@ class KeyguardClockFrame(
 ) : FrameLayout(context, attrs) {
     private var drawAlpha: Int = 255
 
+    init {
+        setLayerType(View.LAYER_TYPE_SOFTWARE, null)
+    }
+
     protected override fun onSetAlpha(alpha: Int): Boolean {
         drawAlpha = alpha
         return true