Move fake display topology population to InputManagerService

This CL moves fake display topology population to InputManagerService
from where actual topology will be set in future. This will also allow
population of same topology in InputDispatcher in upcoming CLs.

Test: atest inputflinger_test
Bug: 367659738
Bug: 367660694
Flag: com.android.input.flags.connected_displays_cursor
Change-Id: I85a98df6ffd446a3760b74d20a303d2539af1fbe