drivers: LC898212 Media controller driver

drivers: LC898212 Media controller driver

Add lc898212 focuser driver support
Add camera common focuser APIs and the init
routines for v4l2 focusers
Add multiple subdevices programming in the
media links connected to single video node

Bug 1701610
Bug 1700211

Change-Id: Ibbbabf631002e5ce2d381bab7fdc91ee05ec14a3
Signed-off-by: Bhanu Murthy V <bmurthyv@nvidia.com>
Reviewed-on: http://git-master/r/842478
Reviewed-by: Frank Chen <frankc@nvidia.com>
Reviewed-by: David Wang (SW-TEGRA) <davidw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jihoon Bang <jbang@nvidia.com>