we are making use of spinlock in functional driver to avoid the race on reading the PTP registers, so use delay instead of sleep. Bug 200512422 Change-Id: Ide1b4e8555eab88076e5de46ab919b50d16e4f6b Signed-off-by: Narayan Reddy <narayanr@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2164976 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>