init: uevent: Add msm video symbolic link handling

Create meaningful symbolic links for video encode/decode
devices based on link_name sysfs node so that video client
doesn't have to rely on dynamic dev node names like device32,
device33 etc.

Change-Id: Id308a10d3e601616b63ecd1373809c96f0d04435
Merge branch 'cm-10.1' into martincz