panfrost: Revert "Disable frame throttling"
This reverts commit 4fee7b30, which was intended to be a temporary workaround for a leak introduced in a65e29cc ("gallium: simplify throttle implementation"). However, that leak was then fixed in 023282a4 and we forgot to revert this hack. Closes: #2108 Signed-off-by:Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Cc: mesa-stable Part-of: <mesa/mesa!5858> (cherry picked from commit 40b99bb7)