Make activities trageting SDK N or greater resizeable by defualt

Also, removed condition that prevented activity from setting
device orientation if it is resizeable. We only need to prevent
it from affecting the orientation when it isn't fullscreen and
not all the time. Work is being tracked in bug 24685213.

Bug: 19865400
Change-Id: I9e1ea77c6acd13801a06f791e0b8859fbcb0f15c