Override to full-screen for fixed orientation

Only override activities that request fixed orientation landscape or
portrait as they will be most likely letterboxed.
SCREEN_ORIENTATION_LOCKED or SCREEN_ORIENTATION_NOSENSOR will still be
full-screen even though they are fixed orientation.

Fix some broken javadoc links.

Flag: EXEMPT bug fix
Fix: 315936527
Test: atest SizeCompatTests
      atest AppCompatOrientationPolicyTest
Change-Id: I316fa3561b6a3fa2468b0a075a611009fd493832