Fix boot animation rotation problem when ro.sf.hwrotation is set to 90 or 270

Change-Id: I7ad3c83e23ce38280818ec5283d173d50c889531
surfaceflinger: Consolidate display orientation compensation hooks

Dedupe rotation calculation code and make rotation a statically
available property in the DisplayDevice
Change-Id: Ic517ab0d2c05026cd6fa46d664aab7926be17b62