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