surfaceflinger: Less aggressive HDMI rotation on LGE star

Commit 414d4864 (surfaceflinger:
Update star HDMI rotation for new userspace) added a rotation
setting for every drawn frame, which is overkill. Setting the
display rotation when the orientation changes is sufficient.

Change-Id: I9882cf2756481e9f88e5b52adbd5a87f86d85623