msm: mdss: Clean-up payload for unsupported versions

When 32 bit process calls the post processing ioctls compat layer
functions will be called. If post processing version is not supported
payload needs to be freed. Change adds support for clean-up.

Change-Id: Ib3c4d60b858ddd952a3906946458aa2bf2c69076
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>