Let system control IME for ineligible display

When IME is requested from a display that cannot show IME, we fallback
to StatusBar to control IME. However, StatusBar isn't always available.
In such cases, let the system control the IME.

Fix: 158122585
Fix: 148234093
Test: atest MultiDisplaySecurityTests
Change-Id: I4d2245402952590af6b5fcc91309a3b01885fd8e