Remove unused fields of window animator

Since no one sets SET_UPDATE_ROTATION, copyAnimToLayoutParams
always returns false. And because mBulkUpdateParams is only
checked with the method, the value of mBulkUpdateParams also
doesn't matter. So both them can be removed.

Bug: 163976519
Flag: EXEMPT remove unused code
Test: CtsWindowManagerDeviceWindow
Change-Id: I32a357c29493a9802bc34154718f36e0ad279c97