[automerger] mm-video-v4l2: Protect buffer access and increase input buffer...

[automerger] mm-video-v4l2: Protect buffer access and increase input buffer size am: fd2e438d am: 911653dd am: 6163f437 skipped: 11e5eb26 am: d63fa416 am: b1fffae3 am: 22bd67e0

Change-Id: I934e292de77dd34eea57c0125ad32f002b19fa9f