Revert "msm: mdss: Handle case when pipe is not idle during cleanup."

This reverts commit 8cb0b7b726c4d645b185c33d9a89086c78da18c9.
Revert "msm: mdss: ensure pipe is halted before freeing buffers"

This reverts commit 3e52190078747d0fa630b35e84e9a676be1bde46.