Respect max fps if specified in the request.

Sleep for appropriate amount of time before acquiring new image
from Surface in case acquiring image imediatelly would exceed max fps
specified by the request.

This is relanding previously reverted change, which contained a bug
overriding the max fps to 1 in case it was explicitly set.

Bug: 338251124
Test: atest CtsVirtualDevicesCameraCtsTestCases
Change-Id: Iab6d951a296c1559658565b37f64516de4dd464b