PhoneWindowManager: allow force default rotation for TV

TV's DP is 960x540, it doesn't satisfy the 960x720 minimal
requirement for config_forceDefaultOrientation=true to work.
skip the DP check for TV.

Test: adb shell settings put system user_rotation 1
Bug: 71769797

Change-Id: I07ba068601cef3b6ebb363fe0b0bc7af9f198360