Revert "vidc: Use O_SYNC for pmem device."

This reverts commit b86991d5218fa023b2be7dfabe9b6e7ec2f2e5e9.
Revert "Revert "mm-video: Add support for ouput buffers color conversion.""

This reverts commit 739180ea8e8698c18588a5312d8f1c40d4500e04.
Revert "Revert ION heap_mask changes"

This reverts commit e9cf7c054498a7691a538e53f4bcaf3cfd224a40.