updated pin input focused state to show outline

PIN based input fields will now show an outline highlight, however this
will only happen when a keyboard is connected to the device. PIN input field has
also been updated based on new UI Specs go/pin-focus-states

Fixes: 316106516
Test: open pin bouncer with physical keyboard -> Check that pin input field shows outlines rather than gray rectangle.
Flag: ACONFIG com.android.systemui.pin_input_field_styled_focus_state DISABLED
Change-Id: I38d9fd765ec7408219dc885f7d608e715afd8e54
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 5b21854..a9f5e22 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -327,3 +327,10 @@
    description: "Relocate Smartspace to bottom of the Lock Screen"
    bug: "316212788"
 }
+
+flag {
+   name: "pin_input_field_styled_focus_state"
+   namespace: "systemui"
+   description: "Enables styled focus states on pin input field if keyboard is connected"
+   bug: "316106516"
+}