msm: camera_v2: Free actuator i2c tbl memory

Function msm_actuator_init() is called multiple
times and we need to free i2c_reg_tbl first to
avoid leaking the associated memory.

Change-Id: I3360be781c31df713be270fb172e1ef13537e613
Signed-off-by: Evgeniy Borisov <eborisov@codeaurora.org>