[SF] Remove checks for primary display in DisplayDevice::setProjection()

mPhysicalOrientation should be set only for primary displays by
SurfaceFlinger and the checks in DisplayDevice are redundant.

Bug: 161793589
Bug: 165184567
Test: 1. source build/envsetup.sh && lunch cf_x86_phone-userdebug && m
      2. Test rotation
Test: scrcpy
Change-Id: I3dee8c034b6d0ccd0b8a96ac007e35f614853d54