msm: mdss: unstage pipes after entering display recovery sequence

When there are any issues halting pipes during free, we go into recovery
sequence where pipes that cannot be cleaned up are forcefully staged to
get recovered. After this we need to remove them to complete recovery
sequence, otherwise it will remain active which is not the intention.
Also add check to ensure we catch such cases for all dual mixer cases.

Change-Id: If9fb04130de286eb1bf9a8171461df693dc2493d
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>