Don't set screen state until boot is completed

Setting the screen state of non-default displays during boot removes the static logo and results in either a black screen (if the display is off) or the boot animation with an incorrect size (if the display is on).

Bug: 267484164
Test: atest com.android.server.display
Change-Id: I11f65f008791470b00a1677beab3f6168589608f