Added styled focus outline to password input field

When a physical keyboard is connected the password input field
will show a rectangular outline when focused and the input method
icon will show a circular outline when focused.
UI Specs go/pin-focus-states

Test: Manual, set auth to password, open unlock screen with pK
connected, ensure focus outline is consistent with UI specs.
Flag: ACONFIG com.android.systemui.pin_input_field_styled_focus_state DISABLED
Fixes: 320249707

Change-Id: I1bd36bbadc4a8077ecfd202d6c2d51faedd2dc90