Update notes for submitted changes

* msm: vidc: free the recon buffers in cleanup function
Update notes for submitted changes

* msm: vidc: Validate userspace buffer count
* msm: vidc: Validate userspace buffer count before using it
* msm: vidc: Check validity of userspace address
* msm: vidc: Initialize kernel space stack variables
* msm: vidc: Validate input data before processing
* msm: vidc: return error in case of init failure