Revert "gpu: nvpgu: disable all engine activity during poweroff"

Revert "gpu: nvpgu: disable all engine activity during poweroff"

This reverts commit f5b13bda8fc76f55e7312f4edb899efb2ab8a195.

WFI added with this patch times out sometimes and fails
graphics stability test
Hence revert the patch for now

Bug 200187904
Original Bug 1715732

Change-Id: Id8c936d38d2ffd60e79e6d637d1c3eda10104d4b
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1134920
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>