msm: camera: add support for bidirectional vcm actuator

Add support in actuator driver to support bi vcm and
extend the functionality to suppport direction, pre
and post move register configuration. Extend the init
setting size macro to support this actuator.

Change-Id: I55a2aa49deec08066b2cd0f220da4ceb1bee1f01
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>
Signed-off-by: Xu Han <hanxu@codeaurora.org>