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.

(cherry picked from commit d26280b5d327994c3c89c573de7738b3f47b8600)
(cherry picked from commit c8f57166fadd26648bd9ee0a979a789c944ccba3)
(cherry picked from commit 72e4c35b308270f44795ebcc196319096397c6c1)
(cherry picked from commit aec73795517e7f49c5ebbea611da612b99ba75fb)

Change-Id: Id308a10d3e601616b63ecd1373809c96f0d04435